Fix PPC64 page size in binary builds. #494

Job	Run time
linux (x86_64-unknown-linux-gnu)	8m 25s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 13s
linux (i686-unknown-linux-gnu)	12m 27s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 22s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	8m 40s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	8m 45s
linux-s390x (s390x-unknown-linux-gnu, s390x)	14m 17s
linux-arm (arm-unknown-linux-musleabihf, arm)	8m 43s
macos-aarch64	9m 56s
macos-x86_64	9m 32s
musllinux (x86_64-unknown-linux-musl)	8m 45s
musllinux (i686-unknown-linux-musl)	8m 23s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 24s
sdist	7m 50s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	8m 29s
windows (x86_64-pc-windows-msvc, x64)	16m 31s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16, nightly)	6m 58s
windows (i686-pc-windows-msvc, x86)	14m 16s
	2h 59m 56s

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