first commit
Squashed 'jni/pngquant/' content from commit 5f03ca2

git-subtree-dir: jni/pngquant
git-subtree-split: 5f03ca2195f08b74240442cd56682ef7ffd6eafb
Merge commit 'd3fce6ab1a0e7c49be27db5b4ea68d541e7fba19' as 'jni/pngquant'
patched pam.h to support compilation for x86 PIC arch, compiled lib and added prebuilts