gcc: changed to to explicitely inject '-mtune=generic' while building a generic x86-64 target without CPU specific optimzation

base/gcc/arch/options.x86-64.in

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../gcc/arch/options.x86-64.in
-# Copyright (C) 2008 The OpenSDE Project
+# Copyright (C) 2008 - 2010 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 #
 # More information can be found in the files COPYING and README.
@@ -14,7 +14,8 @@
 # --- SDE-COPYRIGHT-NOTE-END ---
 
 case "$SDECFG_X8664_OPT" in
-    generic) ;;
+    generic)
+	var_append GCC_WRAPPER_INSERT " " "-mtune=generic" ;;
     em64t)
 	var_append GCC_WRAPPER_INSERT " " "-march=nocona" ;;
     *)