feat: mman `NonNull` #29

Job	Run time
macos	1m 24s
minver	13s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 9s
rustfmt	7s
linux_native_builds (x86_64-unknown-linux-musl)	1m 24s
rust_stable	1m 37s
tier3 (x86_64-unknown-dragonfly)	52s
tier3 (x86_64-unknown-openbsd)	56s
tier3 (armv7-unknown-linux-uclibceabihf)	57s
tier3 (x86_64-unknown-haiku)	51s
cross_compiling (aarch64-linux-android)	32s
cross_compiling (arm-linux-androideabi)	35s
redox	49s
cross_compiling (armv7-linux-androideabi)	31s
cross (arm-unknown-linux-gnueabi)	1m 34s
cross_compiling (i686-linux-android)	36s
cross (armv7-unknown-linux-gnueabihf)	1m 34s
cross_compiling (x86_64-linux-android)	31s
cross_compiling (arm-unknown-linux-musleabi)	32s
cross (i686-unknown-linux-gnu)	1m 32s
cross (i686-unknown-linux-musl)	2m 12s
cross_compiling (x86_64-unknown-fuchsia)	39s
cross (mips-unknown-linux-gnu)	1m 31s
cross_compiling (x86_64-unknown-illumos)	42s
cross (mips64-unknown-linux-gnuabi64)	1m 32s
cross_compiling (aarch64-apple-ios, true)	44s
cross (mips64el-unknown-linux-gnuabi64)	2m 33s
cross_compiling (powerpc64-unknown-linux-gnu)	33s
cross (mipsel-unknown-linux-gnu)	2m 21s
cross_compiling (s390x-unknown-linux-gnu)	37s
cross (powerpc64le-unknown-linux-gnu)	2m 23s
cross_compiling (x86_64-unknown-linux-gnux32)	35s
cross_compiling (x86_64-unknown-netbsd)	17s
	34m 55s

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