feat: mman `NonNull` #33

Job	Run time
macos	1m 36s
tier3 (x86_64-unknown-dragonfly)	49s
minver	19s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 37s
tier3 (x86_64-unknown-openbsd)	1m 8s
rust_stable	1m 35s
linux_native_builds (x86_64-unknown-linux-musl)	58s
tier3 (armv7-unknown-linux-uclibceabihf)	58s
rustfmt	4s
tier3 (x86_64-unknown-haiku)	1m 24s
redox	46s
cross (arm-unknown-linux-gnueabi)	2m 46s
cross_compiling (aarch64-linux-android)	28s
cross (armv7-unknown-linux-gnueabihf)	9m 1s
cross_compiling (arm-linux-androideabi)	31s
cross (i686-unknown-linux-gnu)	2m 34s
cross_compiling (armv7-linux-androideabi)	44s
cross (i686-unknown-linux-musl)	1m 48s
cross_compiling (i686-linux-android)	29s
cross (mips-unknown-linux-gnu)	1m 35s
cross_compiling (x86_64-linux-android)	28s
cross (mips64-unknown-linux-gnuabi64)	1m 32s
cross_compiling (arm-unknown-linux-musleabi)	28s
cross (mips64el-unknown-linux-gnuabi64)	1m 34s
cross_compiling (x86_64-unknown-fuchsia)	41s
cross (mipsel-unknown-linux-gnu)	2m 39s
cross_compiling (x86_64-unknown-illumos)	26s
cross (powerpc64le-unknown-linux-gnu)	1m 46s
cross_compiling (aarch64-apple-ios, true)	23s
cross_compiling (powerpc64-unknown-linux-gnu)	36s
cross_compiling (s390x-unknown-linux-gnu)	45s
cross_compiling (x86_64-unknown-linux-gnux32)	46s
cross_compiling (x86_64-unknown-netbsd)	26s
	43m 40s

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