Make canaries 31-bit instead of 32-bit to appease assembler

globals.h

@@ -99,7 +99,7 @@ class PNOptions
 			if (canary_value_inited) 
 				return canary_value; 	
 			else 
-				return (rand()&0xffff) | (rand()<<16); 
+				return (rand()&0x7ffffff);
 		}
 
 		void setDoCanaries   (bool canaries   ) { do_canaries = canaries; }