Fix compilation on ARM #6190

Job	Run time
build (macos-latest, gfortran, make)	13m 2s
neoverse_build	8m 29s
build (ubuntu-latest, gfortran, cmake)	48m 29s
build (ubuntu-latest, flang, make)	5m 20s
build (macos-latest, gfortran, cmake)	32m 54s
msys2 (UCRT64, int64, Release)	14m 58s
msys2 (UCRT64, int32, Release)	16m 29s
build (ubuntu-latest, gfortran, make)	22m 40s
build (ubuntu-latest, flang, cmake)	11m 44s
msys2 (MINGW32, int32, Release)	16m 10s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 46s
msys2 (CLANG64, int32, Release)	19m 46s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 31s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	13m 40s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	3m 5s
msys2 (CLANG64, int64, Release)	17m 42s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	3m 10s
	4h 14m 55s

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