am db7b9f70: Merge changes I7352dc43,Icc1c3225,Idd0e4950,I5b709c56,Ia12bbb4d, ...
* commit 'db7b9f70d3b01c037bf20fc619137c414f20e0fb':
vl-android.c: Support EXT4 cache partitions.
android/filesystems/partition_types.h: new header
Support EXT4 cache partition images.
Add android_createEmptyExt4Image()
distrib/ext4_utils: new third-party library sources.
distrib/libselinux: Add new third-party library sources.
distrib/libsparse: Add new third-party library sources.
distrib/zlib-1.2.8: Build as static libraries.