evas: fixed detection of X11 by exporting the xorg-server libdir as LDFLAGS

e17/evas/evas.conf

@@ -47,6 +47,8 @@ fi
 if pkginstalled xorg-server ; then
 	var_append confopt " " "--x-includes=$( pkgprefix includedir xorg-server )"
 	var_append confopt " " "--x-libraries=$( pkgprefix libdir xorg-server )"
+	var_append LDFLAGS ' ' "-L$( pkgprefix -r libdir xorg-server )"
+	export LDFLAGS
 fi
 
 # check if we can enable the OpenGL X11 display engine