Revert "Link to libgcc when statically linking musl"
Revert "Link to libgcc when statically linking musl"

This reverts commit 920cfeace9918c47cdd42214fda545f4a284cded.

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