DO NOT MERGE - fix FTS3 column pointer handling

Add new interfaces sqlite3_result_pointer(), and sqlite3_value_pointer()
and use them to transfer the eponymous FTS3 column pointer to the
snippet() and offsets() routines.

Bug: 63852675
Change-Id: I0f0be2bfc21aef8917da63d76d1007fbf8c8ad4d
(cherry picked from commit f856b3209b8c3e62fcb4b2bbc7527d715c9e815e)
7 files changed
tree: d3100f55781eaabcc57efe3b590bdc62990b58f9
  2. README.version
  3. android/
  4. dist/