Fixes for libpng 1.6
Fixes for libpng 1.6

 png_set_filler() now fails if the color type doesn't support
 a filler (such as RGB_ALPHA)
 png_set_unknown_chunk location bug was fixed and now enforces
 proper location setting

Change-Id: If3834e3744d9618c308cc442e66d85e9cffcea38

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base