Removed /r:corlib.dll and /nostdlib switches, does anything break?

This fixes the corcompare issue

svn path=/trunk/mcs/; revision=4284

mcs/class/System/System.build

@@ -10,10 +10,12 @@
 		<csc target="library" output="../lib/System.dll" debug="${debug}">
 			<arg value="/nowarn:1595"/>
 			<arg value="/unsafe"/>
-			<arg value="/nostdlib"/> 	<!-- don't reference mscorlib -->
 			<arg value="/noconfig"/>	<!-- don't reference ms assemblies -->
 			<arg value="/lib:../lib/"/>
-			<arg value="/r:corlib.dll"/>
+			
+			<!-- cor compare dies with these currently -->
+			<!--arg value="/nostdlib"/--> 	<!-- don't reference mscorlib -->
+			<!--arg value="/r:corlib.dll"/-->
 			<arg value="/r:System.Xml.dll"/>
 			<sources>
 				<includes name="**/*.cs"/>