CMake: Pass `OpenMP` compiler and linker flags through CMake targets #5523

Job	Run time
build (ubuntu-latest, gfortran, cmake)	46m 55s
build (macos-latest, gfortran, cmake)	27m 31s
build (ubuntu-latest, flang, cmake)	45m 4s
build (ubuntu-latest, gfortran, make)	21m 13s
neoverse_build	11m 4s
msys2 (UCRT64, int32, Release)	1h 47m 26s
build (macos-latest, gfortran, make)	10m 21s
msys2 (CLANG64, int64, Release)	1h 9m 23s
build (ubuntu-latest, flang, make)	17m 31s
msys2 (CLANG64, int32, Release)	1h 11m 40s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	7m 57s
msys2 (UCRT64, int64, Release)	1h 45m 58s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	8m 7s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	8m 39s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	9m 42s
msys2 (MINGW32, int32, Release)	1h 7m 23s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	1h 37m 49s
	12h 13m 43s

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