fix warning not recognized in recent Xcode

Seems the trailing semicolon confuses Xcode 5,
as the setting which has it and the following
one are somewhat misinterpreted. With the
semicolon they're only applied to Debug / Release
configuration but not to the other. Removing
the semicolon fixes that.
Merge pull request #9 from diederich/fixSemicolon

fix warning not recognized in recent Xcode