libsparse: Use BIONIC implementation of mmap64()

Change-Id: I63692629d3a62b7aee21202b67241904b1cc9789
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Merge "libsparse: Use BIONIC implementation of mmap64()"
Merge https://android.googlesource.com/platform/system/core