Linux x32 does not support sysctl

libc-test/build.rs

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

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

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

src/unix/notbsd/linux/other/b64/not_x32.rs

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

src/unix/notbsd/linux/other/b64/sparc64.rs

src/unix/notbsd/linux/other/mod.rs