Added support for application/x-nintendo-ds-rom mime type

in gtk desktop file.
Also added some (un)install hooks so that mime type
database is updated when (un)installing the gtk port.
Those two changes let users double-click on a rom to open
it with the gtk port.

desmume/configure.ac

@@ -151,6 +151,8 @@ AC_PROVIDE_IFELSE([PKG_PROG_PKG_CONFIG], [
     PKG_CHECK_MODULES(LIBAGG, libagg >= 2.5.0, HAVE_LIBAGG=yes, HAVE_LIBAGG=no)
     AC_SUBST(LIBAGG_CFLAGS)
     AC_SUBST(LIBAGG_LIBS)
+
+    AC_PATH_PROG(UPDATEDESKTOP, [update-desktop-database])
   fi
 ],[
     echo "WARNING: pkg-config is not available therefore gtk, gtk-glade UIs and lua scripting are not available either."

desmume/src/gtk/Makefile.am

@@ -24,3 +24,17 @@ desmume_LDADD = ../libdesmume.a \
 if HAVE_GDB_STUB
 desmume_LDADD += ../gdbstub/libgdbstub.a
 endif
+
+UPDATE_DESKTOP = \
+  appsdir=$(DESTDIR)$(datadir)/applications ; \
+  if [ -f $$appsdir/mimeinfo.cache ] ; then \
+    if test ! "x$(UPDATEDESKTOP)" = "x" ; then \
+      $(UPDATEDESKTOP) $$appsdir ; \
+    fi \
+  fi
+
+install-data-hook:
+	$(UPDATE_DESKTOP)
+
+uninstall-hook:
+	$(UPDATE_DESKTOP) 

desmume/src/gtk/desmume.desktop

@@ -7,3 +7,4 @@ TryExec=desmume
 Exec=desmume
 Icon=DeSmuME
 Categories=GNOME;GTK;Game;Emulator;
+MimeType=application/x-nintendo-ds-rom;