Fix Mantis 3029: Clang warning: expression result unused in multi_pinfo_blit_squadron_logo()

git-svn-id: svn://svn.icculus.org/fs2open@10556 387891d4-d844-0410-90c0-e4c51a9137d3
Fix issue 3030: Clang warning: semantic issue, '&&' within '||' in gr_[re|un]size_screen_pos() and gr_[re|un]size_screen_posf()

git-svn-id: svn://svn.icculus.org/fs2open@10557 387891d4-d844-0410-90c0-e4c51a9137d3
Project files in Xcode4 folder adopt latest suggested project file settings from Xcode 5.1.1

git-svn-id: svn://svn.icculus.org/fs2open@10558 387891d4-d844-0410-90c0-e4c51a9137d3