Fix some compiler warnings that show up when building the amalgamation only. (CVS 5927)

FossilOrigin-Name: d1abe8a1c9a990b02c71d6c249436381c9fde443

src/mem5.c

@@ -23,7 +23,7 @@
 ** This version of the memory allocation subsystem is included
 ** in the build only if SQLITE_ENABLE_MEMSYS5 is defined.
 **
-** $Id: mem5.c,v 1.18 2008/11/19 14:35:47 danielk1977 Exp $
+** $Id: mem5.c,v 1.19 2008/11/19 16:52:44 danielk1977 Exp $
 */
 #include "sqliteInt.h"
 
@@ -461,6 +461,8 @@ void sqlite3Memsys5Dump(const char *zFilename){
   }else{
     fclose(out);
   }
+#else
+  UNUSED_PARAMETER(zFilename);
 #endif
 }