linux

Fix OTHER_CFLAGS order for Xcode backend #17162

Job	Run time
Arch Linux	20m 40s
CUDA (on Arch)	7m 3s
Arch / PyPy	20m 1s
Fedora	18m 13s
Gentoo	21m 59s
Ubuntu Rolling (gcc, g++)	19m 29s
OpenSUSE	16m 32s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 35s
Ubuntu Bionic	15m 6s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 10s
Ubuntu Rolling (clang, clang++)	22m 8s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 8s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	14m 8s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 40s
	3h 51m 52s

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