- force configure to use sqlite from platform sdk,
- force configure to not use mpfr.

fixes https://github.com/p2/Redland-ObjC/issues/11
Merge pull request #12 from mro/feature/sqlite

Enable sqlite storage
fix stupid typo. refs https://github.com/p2/Redland-ObjC/pull/12
Merge remote-tracking branch 'origin/master'