Making signal API real-time signal aware #1323

Job	Run time
macos	5m 7s
macos-aarch64	2m 38s
linux_native_builds (x86_64-unknown-linux-gnu)	3m 29s
linux_native_builds (x86_64-unknown-linux-musl)	3m 29s
minver	17s
rust_stable	1m 30s
rustfmt	17s
tier3 (x86_64-unknown-dragonfly)	1m 1s
tier3 (x86_64-unknown-openbsd)	1m 4s
tier3 (x86_64-unknown-haiku)	56s
redox	37s
cross (arm-unknown-linux-gnueabi)	1m 44s
cross_compiling (aarch64-linux-android)	35s
cross (armv7-unknown-linux-gnueabihf)	1m 46s
cross_compiling (arm-linux-androideabi)	38s
cross (i686-unknown-linux-gnu)	1m 47s
cross_compiling (armv7-linux-androideabi)	37s
cross (i686-unknown-linux-musl)	1m 56s
cross_compiling (i686-linux-android)	33s
cross_compiling (x86_64-linux-android)	35s
cross (mips-unknown-linux-gnu)	1m 57s
cross_compiling (arm-unknown-linux-musleabi)	39s
cross (mips64-unknown-linux-gnuabi64)	1m 47s
cross_compiling (x86_64-unknown-fuchsia)	30s
cross (mips64el-unknown-linux-gnuabi64)	1m 50s
cross_compiling (x86_64-unknown-illumos)	30s
cross (mipsel-unknown-linux-gnu)	1m 53s
cross_compiling (aarch64-apple-ios, true)	33s
cross (powerpc64le-unknown-linux-gnu)	1m 45s
cross_compiling (powerpc64-unknown-linux-gnu)	42s
cross_compiling (s390x-unknown-linux-gnu)	43s
cross_compiling (x86_64-unknown-linux-gnux32)	41s
cross_compiling (x86_64-unknown-netbsd)	35s
	44m 41s

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