fbc: suppress warning when bootstrapping

Author: jayrm

src/compiler/fbc.bas

@@ -1264,7 +1264,8 @@ private function hLinkFiles( ) as integer
 			exit function
 		end if
 
-		put #f, 533, clng( fbGetOption( FB_COMPOPT_STACKSIZE ) )
+		dim value as long = clng( fbGetOption( FB_COMPOPT_STACKSIZE ) )
+		put #f, 533, value
 
 		close #f