Switch MINGW-W64 jobs to UCRT #546

Job	Run time
build (ubuntu-latest, gfortran, cmake)	14m 47s
build (ubuntu-latest, gfortran, make)	8m 13s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	5m 4s
build (ubuntu-latest, flang, cmake)	17m 41s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	5m 0s
build (ubuntu-latest, flang, make)	7m 52s
build (macos-latest, gfortran, cmake)	1h 2m 17s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	4m 33s
build (macos-latest, gfortran, make)	15m 21s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	4m 49s
msys2 (UCRT64, int32, Release)	2h 51m 23s
msys2 (UCRT64, int64, Release)	3h 42m 11s
msys2 (MINGW32, int32, Release)	22m 48s
msys2 (CLANG64, int32, Release)	1h 43m 17s
msys2 (CLANG64, int64, Release)	2h 3m 19s
msys2 (CLANG32, int32, Release)	17m 1s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	3h 24m 0s
	16h 49m 36s

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