src/libs/cplusplus/MatchingText.cpp(64): warning #161: unrecognized #pragma
  #    pragma GCC diagnostic ignored "-Wstrict-overflow"
              ^

This pragma is recognised in GCC only, so don't enable it for when ICC
fakes to be GCC.

Change-Id: I3d9830dc2b12632dd08d8c8961219bd253ad8c1d
Reviewed-by: hjk <qthjk@ovi.com>