Ensure host modules' cflags get Wno-strict-aliasing

no-op on target modules
inspired by one of PrimeDirective's "edit 50 makefiles to improve build times by reducing aliasing-violation hunting" commits

Change-Id: I3b847ecb89caf255be6d1d9d6fa5557ac8514376
Merge "Ensure host modules' cflags get Wno-strict-aliasing" into kk44