Auto merge of #2577 - sunfishcode:sunfishcode/wasi-max-align-t, r=Amanieu
Auto merge of #2577 - sunfishcode:sunfishcode/wasi-max-align-t, r=Amanieu

Define max_align_t for wasi.

WASI has a normal max_align_t.

rust-lang/libc,rust-lang/libc,rust-lang/libc