Log Message:
Update geography/mapcode to 2.5.1. Fix cmake build.

2.5.1
- Updated unit test to compile with plain C and added some test cases.

2.5.0
- Added support for getting territory names in English and local
  alphabets.
- Added much improved unit test scripts to run gprof, valgrind,
  the CLang address sanitize and compare the output of the new library
  with and older version.