Add syscall constants to more Android/Linux targets

src/unix/notbsd/android/b32/arm.rs

src/unix/notbsd/android/b64/aarch64.rs

src/unix/notbsd/linux/mips/mips32.rs

src/unix/notbsd/linux/mips/mips64.rs

src/unix/notbsd/linux/musl/b32/arm.rs

src/unix/notbsd/linux/musl/b32/mips.rs

src/unix/notbsd/linux/musl/b64/aarch64.rs

src/unix/notbsd/linux/musl/b64/powerpc64.rs

src/unix/notbsd/linux/other/b32/arm.rs

src/unix/notbsd/linux/other/b32/powerpc.rs

src/unix/notbsd/linux/other/b64/aarch64.rs

src/unix/notbsd/linux/other/b64/powerpc64.rs

src/unix/notbsd/linux/s390x.rs