Fix AIX build #5086

Job	Run time
build (ubuntu-latest, gfortran, cmake)	42m 12s
build (ubuntu-latest, gfortran, make)	16m 40s
build (ubuntu-latest, flang, cmake)	13m 19s
build (ubuntu-latest, flang, make)	7m 51s
build (macos-latest, gfortran, cmake)	28m 3s
build (macos-latest, gfortran, make)	5m 27s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	5m 39s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	4m 48s
msys2 (UCRT64, int32, Release)	1h 43m 55s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	5m 37s
msys2 (UCRT64, int64, Release)	1h 46m 31s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	4m 48s
msys2 (MINGW32, int32, Release)	1h 4m 37s
msys2 (CLANG64, int32, Release)	53m 36s
msys2 (CLANG64, int64, Release)	54m 53s
msys2 (CLANG32, int32, Release)	45m 40s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	1h 38m 49s
	11h 2m 25s

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