Revert "Handle Clang's change of defaults from -fcommon to -fno-common"

This reverts commit a4a4d295.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_udc-dev-plus-aosp&target=aosp_cheetah-trunk_staging-userdebug&lkgb=10647066&lkbb=10647484&fkbb=10647184, bug 295551355.

Bug: 295551355

Change-Id: I9b68cdac258b26f975e1e575a383b789c87adaa4