Use c99 as default.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/xcode/trunk@37125 72102866-910b-0410-8b05-ffd578937521
2013-09-21 08:17-EDT Gregory John Casamento <greg.casamento@gmail.com>                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                
        * PBXFileReference.m: Add all subdirectories in the project                                                                                                                                                                                                             
        to the include directives.  


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/xcode/trunk@37126 72102866-910b-0410-8b05-ffd578937521