Use a global flags instance for wheel check #2941

Job	Run time
macos-aarch64	21m 40s
macos-x86_64	18m 38s
sdist	14m 24s
linux-s390x (s390x-unknown-linux-gnu, s390x)	13m 13s
windows (x86_64-pc-windows-msvc, x64)	18m 41s
windows (i686-pc-windows-msvc, x86)	20m 47s
windows (aarch64-pc-windows-msvc, x64)	19m 24s
linux (x86_64-unknown-linux-gnu, gcc)	11m 11s
linux (i686-unknown-linux-gnu, gcc -m32)	11m 59s
linux-riscv64 (riscv64gc-unknown-linux-gnu, riscv64)	12m 54s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	16m 21s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	16m 58s
linux-arm (arm-unknown-linux-musleabihf, arm)	16m 32s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	20m 37s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	15m 12s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	18m 13s
musllinux (i686-unknown-linux-musl)	14m 29s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	16m 32s
musllinux (x86_64-unknown-linux-musl)	14m 55s
	5h 12m 40s

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