Remove unused dependencies

src/artis-star.pc.in

@@ -5,7 +5,7 @@ includedir=${prefix}/include
 
 Name: vle
 Description: ARTIS multimodelling and Simulation tools
-Requires: libxml-2.0 glibmm-2.4
+Requires:
 Version: @ARTIS_VERSION@
 Libs:	-L${libdir} \
     -lpdevs-@ARTIS_VERSION_SHORT@