Make frontends depend on just libev. Rework and group CFLAGS/LIBS

Make frontends depend on just libev. Rework and group CFLAGS/LIBS

2005-07-07  Marco Pesenti Gritti  <mpg@redhat.com>

        * Makefile.am:
        * backend/Makefile.am:
        * configure.ac:
        * cut-n-paste/recent-files/Makefile.am:
        * cut-n-paste/toolbar-editor/Makefile.am:
        * cut-n-paste/zoom-control/Makefile.am:
        * lib/Makefile.am:
        * pdf/Makefile.am:
        * pixbuf/Makefile.am:
        * properties/Makefile.am:
        * ps/Makefile.am:
        * shell/Makefile.am:
        * thumbnailer/Makefile.am:
        * tiff/Makefile.am:

        Make frontends depend on just libev.
        Rework and group CFLAGS/LIBS definitions.
        Cleanups.