build rom with cfxtoolchain-4.8 (part3)

Summary: Changing paths for 4.8 toolchain in the build repo are causing weird errors, so we're using 4.7's paths for now. In any case, still apply dalvik-centric cflags for 4.8.

Test Plan: shit works, fuck test plans

Reviewers: randall.rushing, Mustaavalkosta

Differential Revision: http://review.codefirex.com/D41

Change-Id: I4268f771f5e42b1caffbc33f4df197b7940c5473
Signed-off-by: DHOMD <DHO@dho.im>