Include trampolines in sdist on Windows #576

Job	Run time
linux (x86_64-unknown-linux-gnu)	9m 34s
linux (i686-unknown-linux-gnu)	14m 34s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 3s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 19s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	11m 12s
macos-aarch64	9m 10s
macos-x86_64	10m 18s
linux-s390x (s390x-unknown-linux-gnu, s390x)	15m 40s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	10m 15s
musllinux (x86_64-unknown-linux-musl)	9m 54s
linux-arm (arm-unknown-linux-musleabihf, arm)	9m 51s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	11m 44s
musllinux (i686-unknown-linux-musl)	9m 39s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	9m 58s
sdist	8m 39s
windows (x86_64-pc-windows-msvc, x64)	17m 12s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16, nightly)	7m 42s
windows (i686-pc-windows-msvc, x86)	19m 5s
	3h 24m 49s

Provide feedback