Add initial support for sparc-unknown-linux-gnu

src/unix/linux_like/linux/align.rs

src/unix/linux_like/linux/gnu/b32/mod.rs

src/unix/linux_like/linux/gnu/b32/sparc/align.rs

src/unix/linux_like/linux/gnu/b32/sparc/mod.rs

src/unix/linux_like/linux/gnu/mod.rs

src/unix/linux_like/linux/no_align.rs