build: fix target header overlay

LOCAL_C_INCLUDES as defined by the makefile should be put AFTER
the overlay includes so the overlay always takes precedence.

Change-Id: I489b2aab6dbacd9122d834f85e07b63ed1271f07
Merge tag 'android-4.3_r2.2' of https://android.googlesource.com/platform/build into cm-10.2

Android 4.3 release 2.2
Merge branch 'jb43-legacy' of https://github.com/ParanoidAndroid/android_build into jb4.3