Do not run the CBLAS_?GEMM3M tests when cross-compiling with gmake #4484

Job	Run time
build (ubuntu-latest, gfortran, cmake)	42m 41s
build (ubuntu-latest, gfortran, make)	16m 18s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 32s
build (ubuntu-latest, flang, cmake)	42m 3s
msys2 (UCRT64, int32, Release)	13m 35s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	7m 44s
build (ubuntu-latest, flang, make)	16m 17s
msys2 (UCRT64, int64, Release)	15m 18s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 27s
build (macos-latest, gfortran, cmake)	55m 33s
msys2 (MINGW32, int32, Release)	22m 1s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	3m 31s
build (macos-latest, gfortran, make)	25m 21s
msys2 (CLANG64, int32, Release)	57m 44s
msys2 (CLANG64, int64, Release)	57m 12s
msys2 (CLANG32, int32, Release)	51m 58s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	13m 57s
	7h 28m 12s

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