pp: Update ldflags for AOSP gcc 4.7

Was returning undefined references for dlopen, dlsym, and dlerror

Change-Id: I3c3840560cb1550f1b6ac6f26fe008a79184a44f
Use linaro 4.7

Change-Id: I976705e009294aaee11605d0c4a146cf1c9ea17c