Use libuv run loop for macOS (CMake)

[louwers]

The CFRunLoop is crashing with GLFW on macOS.

I tried fixing it, but I am getting non-descriptive segfaults.

Stack trace

/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16: runtime error: member call on null pointer of type 'NS::Referencing<MTL::Texture, MTL::Resource>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49: runtime error: member call on null pointer of type 'NS::Referencing<MTL::Texture, MTL::Resource> *'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16: runtime error: member call on null pointer of type 'NS::Referencing<MTL::DepthStencilState>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49: runtime error: member call on null pointer of type 'NS::Referencing<MTL::DepthStencilState> *'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16: runtime error: member call on null pointer of type 'NS::Referencing<MTL::Texture, MTL::Resource>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49: runtime error: member call on null pointer of type 'NS::Referencing<MTL::Texture, MTL::Resource> *'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16: runtime error: member call on null pointer of type 'NS::Referencing<MTL::SamplerState>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSSharedPtr.hpp:219:16 in 
/Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49: runtime error: member call on null pointer of type 'NS::Referencing<MTL::SamplerState> *'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/bart/src/maplibre-native/vendor/metal-cpp/Foundation/NSObject.hpp:112:49 in 
AddressSanitizer:DEADLYSIGNAL
=================================================================
==21109==ERROR: AddressSanitizer: SEGV on unknown address 0x000000010b20 (pc 0x000196424270 bp 0x00016d750a40 sp 0x00016d750a00 T0)
==21109==The signal is caused by a READ memory access.
    #0 0x196424270 in objc_release+0x10 (libobjc.A.dylib:arm64e+0x8270)
    #1 0x196428134 in objc_autoreleasePoolPop+0x100 (libobjc.A.dylib:arm64e+0xc134)
    #2 0x19689c7bc in _CFAutoreleasePoolPop+0x1c (CoreFoundation:arm64e+0x3c7bc)
    #3 0x1969af954 in __CFRunLoopPerCalloutARPEnd+0x2c (CoreFoundation:arm64e+0x14f954)
    #4 0x1968f7e44 in __CFRunLoopDoTimer+0x410 (CoreFoundation:arm64e+0x97e44)
    #5 0x1968f7934 in __CFRunLoopDoTimers+0x160 (CoreFoundation:arm64e+0x97934)
    #6 0x1968dd0ec in __CFRunLoopRun+0x73c (CoreFoundation:arm64e+0x7d0ec)
    #7 0x1968dc330 in CFRunLoopRunSpecific+0x238 (CoreFoundation:arm64e+0x7c330)
    #8 0x196957a0c in CFRunLoopRun+0x3c (CoreFoundation:arm64e+0xf7a0c)
    #9 0x102af0758 in mbgl::util::RunLoop::run() run_loop.cpp:38
    #10 0x1027c4cb0 in GLFWView::run() glfw_view.cpp:1119
    #11 0x1028ef6ac in main main.cpp:222
    #12 0x196474270  (<unknown module>)

This PR changes the CMake config to use the the libuv-based run loop on macOS instead, which seems to work fine.

cmake . -B build \                                                                               
            -G Ninja \
            -DCMAKE_BUILD_TYPE=Debug \
            -DCMAKE_CXX_COMPILER_LAUNCHER=/opt/homebrew/bin/ccache \
            -DMLN_WITH_OPENGL=OFF \
            -DMLN_WITH_METAL=ON \
            -DMLN_LEGACY_RENDERER=OFF \
            -DMLN_DRAWABLE_RENDERER=ON \
            -DMLN_WITH_WERROR=OFF
build/platform/glfw/mbgl-glfw --style "https://tiles.openfreemap.org/styles/liberty"

[github-actions]

Bloaty Results 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-3059-compared-to-main.txt

Compared to d387090 (legacy)

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +30% +34.5Mi  +432% +25.8Mi    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-3059-compared-to-legacy.txt

[github-actions]

Benchmark Results ⚡

Benchmark                                                     Time             CPU      Time Old      Time New       CPU Old       CPU New
------------------------------------------------------------------------------------------------------------------------------------------
OVERALL_GEOMEAN                                            -0.0025         -0.0021             0             0             0             0

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/benchmark-results/pr-3059-compared-to-main.txt

[github-actions]

Bloaty Results (iOS) 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%     -64  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results-ios/pr-3059-compared-to-main.txt

[louwers]

When I run the tests Map.ContinuousRendering hangs.