[libc] Disable GCC 12 waccess passes to fix ICE in environ_internal (#197916)
The waccess pass in GCC 12 consistently segmentation faults when
analyzing the memory allocations in environ_internal.cpp. This change
disables the relevant tree-waccess passes for this specific file,
avoiding the ICE without requiring intrusive code refactoring.
Assisted-by: Automated tooling, human reviewed.