[glibmm] tools/test_scripts/testheaders.sh: Don't request c++11

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 96a7b306819305dc4ffba5835ed55a446973f08e
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Wed Mar 22 11:07:38 2017 +0100

    tools/test_scripts/testheaders.sh: Don't request c++11
    
    Glibmm requires c++14 now, and that's the default c++ version in the
    latest gcc versions.

 tools/test_scripts/testheaders.sh |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/tools/test_scripts/testheaders.sh b/tools/test_scripts/testheaders.sh
index 1c9e274..80c5a67 100755
--- a/tools/test_scripts/testheaders.sh
+++ b/tools/test_scripts/testheaders.sh
@@ -18,6 +18,9 @@ function usage() {
   exit 1
 }
 
+#extra_gcc_args=-std=c++11
+extra_gcc_args=
+
 # Search for directories to include in CFLAGS.
 idirs=""
 while [ $# -gt 0 ]
@@ -75,11 +78,11 @@ do
     for headerfile in $i/${i}mm/*.h
     do
       echo "=== $headerfile"
-      g++ -c -x c++ -std=c++11 -o /dev/null $headerfile $CFLAGS
+      g++ -c -x c++ $extra_gcc_args -o /dev/null $headerfile $CFLAGS
     done
   else
     echo "=== $i"
-    g++ -c -x c++ -std=c++11 -o /dev/null $i $CFLAGS
+    g++ -c -x c++ $extra_gcc_args -o /dev/null $i $CFLAGS
   fi
 done