2006-06-16  Manish Singh  <yosh@gimp.org>

        * app/errors.c
        * app/main.c
        * app/file/gimprecentlist.c
        * libgimpbase/gimpsignal.c
        * libgimp/gimp.c
        * modules/controller_midi.c
        * plug-ins/common/gqbist.c: use _GNU_SOURCE instead of the other
        _FOO_SOURCE variables to support -ansi -pedantic on glibc systems,
        since anything else breaks compilation of otherwise working code.
        Fixes bug #344203.