Work around X86 POTRS/CDOT bug on old systems and add CI job for 32bit manylinux #5794

Job	Run time
neoverse_build	8m 15s
build (ubuntu-latest, flang, cmake)	44m 4s
build (ubuntu-latest, flang, make)	18m 13s
build (ubuntu-latest, gfortran, make)	21m 36s
msys2 (UCRT64, int64, Release)	1h 41m 5s
msys2 (UCRT64, int32, Release)	1h 39m 21s
build (ubuntu-latest, gfortran, cmake)	46m 13s
msys2 (MINGW32, int32, Release)	1h 8m 0s
build (macos-latest, gfortran, make)	13m 16s
msys2 (CLANG64, int32, Release)	1h 21m 0s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	7m 38s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	9m 24s
msys2 (CLANG64, int64, Release)	1h 11m 32s
build (macos-latest, gfortran, cmake)	35m 11s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	1h 32m 18s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	8m 21s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	8m 34s
	12h 14m 1s

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