support mingw - it uses __MINGW_GNUC_PREREQ
support mingw - it uses __MINGW_GNUC_PREREQ

svn path=/branches/work/kdab-post-4.0/kdepim/; revision=724522

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi