drop warning flags not available with gcc < 4

devel/lpeg/patches/patch-makefile

@@ -1,7 +1,7 @@
-$OpenBSD: patch-makefile,v 1.5 2011/06/22 18:09:51 jasper Exp $
---- makefile.orig	Mon Jun 20 23:35:56 2011
-+++ makefile	Mon Jun 20 23:36:51 2011
-@@ -1,7 +1,7 @@
+$OpenBSD: patch-makefile,v 1.6 2011/08/25 19:14:58 naddy Exp $
+--- makefile.orig	Wed Feb 16 16:03:25 2011
++++ makefile	Thu Aug 25 21:09:29 2011
+@@ -1,14 +1,13 @@
  LIBNAME = lpeg
 -LUADIR = /usr/include/lua5.1/
 +LUADIR = ${LOCALBASE}/include/
@@ -9,9 +9,17 @@ $OpenBSD: patch-makefile,v 1.5 2011/06/22 18:09:51 jasper Exp $
 -COPT = -O2 -DNDEBUG
 +COPT = -O2 -DNDEBUG -fPIC -shared
  
- CWARNS = -Wall -Wextra -pedantic \
+-CWARNS = -Wall -Wextra -pedantic \
++CWARNS = -Wall -pedantic \
          -Waggregate-return \
-@@ -21,8 +21,7 @@ CWARNS = -Wall -Wextra -pedantic \
+ 	-Wbad-function-cast \
+         -Wcast-align \
+         -Wcast-qual \
+-	-Wdeclaration-after-statement \
+ 	-Wdisabled-optimization \
+         -Wmissing-prototypes \
+         -Wnested-externs \
+@@ -21,8 +20,7 @@ CWARNS = -Wall -Wextra -pedantic \
  	#  -Wunreachable-code \