improved gcfin handling a bit

attempted to use XLoadFontSet in the x11 plugin experimentally

moo/kernel/System.moo

@@ -36,7 +36,7 @@ class System(Apex)
 
 		gc := false.
 		fin_sem := Semaphore new.
-		
+
 		Processor signalOnGCFin: fin_sem.
 		[
 			while (true)

moo/kernel/X11.moo

@@ -172,6 +172,7 @@ class X11.GC(Object)
 		fontName   := nil.
 
 	var fontPtr := nil.
+	var fontSet := nil.
 
 	method(#class) new
 	{