$NetBSD: patch-source_gmqcc_Makefile,v 1.1 2019/10/01 12:32:26 nia Exp $

Allow pkgsrc to set CXXFLAGS.

--- source/gmqcc/Makefile.orig	2017-04-01 13:28:34.000000000 +0000
+++ source/gmqcc/Makefile
@@ -10,7 +10,7 @@ WINDOWS=1
 endif
 
 CXX ?= clang++
-CXXFLAGS = \
+CXXFLAGS += \
 	-std=c++11 \
 	-Wall \
 	-Wextra \