Revert "corkscrew-x86: Fix build with some glibc versions"

This reverts commit 057455dd10690b6887cd61d89fa4d905a471d828.

Conflicts:
	libcorkscrew/arch-x86/backtrace-x86.c

Change-Id: I0e583c58f45ffb3f9532ac2cfbb203a96336770d