cmake

Fix MSVC compiler flags by using list instead of string concatenation… #463

Job	Run time
codecov	1m 7s
linux_checks (Debug, Default, Valgrind)	9m 13s
linux_archs (i386)	1m 32s
linux_checks (Debug, Default, Sanitizer)	1m 21s
fuzzing	5m 51s
linux_clang_latest	3m 6s
linux_archs (arm32v7)	10s
linux_checks (Debug, ReduceBinary, Valgrind)	8m 6s
linux_archs (arm64v8)	12s
linux_checks (Debug, ReduceBinary, Sanitizer)	1m 0s
linux_gcc_latest	2m 51s
linux_archs (ppc64le)	9s
linux_checks (Release, Default, Valgrind)	2m 28s
linux_gcc4	45s
linux_archs (s390x)	14s
linux_checks (Release, Default, Sanitizer)	1m 27s
linux_archs (riscv64)	10s
linux_checks (Release, ReduceBinary, Valgrind)	7m 37s
linux_gcc5_i386	1m 21s
linux_checks (Release, ReduceBinary, Sanitizer)	1m 10s
linux_opts (gcc, no_fp)	44s
linux_checks (MinSizeRel, Default, Valgrind)	2m 56s
linux_tinycc	32s
linux_opts (gcc, no_reader)	25s
macos_clang	30s
linux_checks (MinSizeRel, Default, Sanitizer)	1m 16s
linux_opts (gcc, no_writer)	31s
linux_opts (gcc, no_utf8)	1m 4s
linux_checks (MinSizeRel, ReduceBinary, Valgrind)	6m 39s
windows_msvc	1m 51s
linux_opts (clang, no_fp)	54s
linux_checks (MinSizeRel, ReduceBinary, Sanitizer)	1m 12s
linux_opts (clang, no_reader)	25s
linux_opts (clang, no_writer)	42s
linux_opts (clang, no_utf8)	1m 6s
	1h 10m 37s

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