Remove flags to turn overriding commands into errors

This is a partial revert of I43b645658f468c23a5b9ebcfcd9d4516537db540

On at least a generic_x86 build internally:

art/build/Android.gtest.mk:121: error: overriding commands for target `Uncompressed', previously defined at art/build/Android.gtest.mk:101

Bug: 77611511
Test: none
Change-Id: I78ca65e6f0c81f09e7da848eda797b3a8f97a521