fix compiling of FS after Gabe's last compile

--HG--
extra : convert_revision : a93fa5ad61aa2b8c18bf6c513b617f3425ffb220
diff --git a/src/sim/faults.cc b/src/sim/faults.cc
index 7aa3ec4..b09bbc1 100644
--- a/src/sim/faults.cc
+++ b/src/sim/faults.cc
@@ -56,7 +56,7 @@
 {
     panic("Unimpfault: %s\n", panicStr.c_str());
 }
-
+#if !FULL_SYSTEM
 void PageTableFault::invoke(ThreadContext *tc)
 {
     Process *p = tc->getProcessPtr();
@@ -78,3 +78,4 @@
         panic("Page table fault when accessing virtual address %#x\n", vaddr);
     }
 }
+#endif