Revert "[compiler-rt] Allow building builtins.a without a libc (#86737)"

This reverts commit 86692258637549ed9f863c3d2ba47b49f61bbc1f.

Reverting due to buildbot failures.

GitOrigin-RevId: a2982a29fdfcfe2904754815c85f630a4dc6d88c
1 file changed