curses: Ignore /usr/bin/ncurses5.4-config on macOS #16646

Job	Run time
Ubuntu Rolling (gcc, g++)	19m 41s
Arch / PyPy	19m 29s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 55s
Arch Linux	20m 9s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	14m 8s
CUDA (on Arch)	7m 23s
Ubuntu Rolling (clang, clang++)	22m 30s
Fedora	20m 2s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 28s
Gentoo	21m 46s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 18s
OpenSUSE	16m 12s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 14s
Ubuntu Bionic	14m 38s
	3h 51m 53s

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