feat: impl AsFd for PtyMaster (#2355) #44

Job	Run time
minver	16s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 26s
macos	3m 22s
macos-aarch64	1m 53s
linux_native_builds (x86_64-unknown-linux-musl)	2m 19s
rust_stable	1m 13s
rustfmt	13s
tier3 (x86_64-unknown-openbsd)	1m 0s
redox	37s
cross (arm-unknown-linux-gnueabi)	1m 44s
cross_compiling (aarch64-linux-android)	35s
cross (armv7-unknown-linux-gnueabihf)	1m 43s
cross (i686-unknown-linux-gnu)	1m 39s
cross_compiling (arm-linux-androideabi)	31s
cross (i686-unknown-linux-musl)	1m 44s
cross_compiling (armv7-linux-androideabi)	36s
cross (mips-unknown-linux-gnu)	1m 43s
cross_compiling (i686-linux-android)	32s
cross (mips64-unknown-linux-gnuabi64)	1m 49s
cross_compiling (x86_64-linux-android)	33s
cross (mips64el-unknown-linux-gnuabi64)	1m 44s
cross_compiling (arm-unknown-linux-musleabi)	36s
cross (mipsel-unknown-linux-gnu)	1m 43s
cross_compiling (x86_64-unknown-fuchsia)	26s
cross (powerpc64le-unknown-linux-gnu)	1m 43s
cross_compiling (x86_64-unknown-illumos)	27s
cross_compiling (aarch64-apple-ios, true)	25s
cross_compiling (powerpc64-unknown-linux-gnu)	36s
cross_compiling (s390x-unknown-linux-gnu)	36s
cross_compiling (x86_64-unknown-linux-gnux32)	33s
cross_compiling (x86_64-unknown-netbsd)	29s
	35m 46s

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