[gtkglarea] configure: Do not overwrite the user variable CFLAGS

[Javier Jardón <jjardon src gnome org>]

commit 227072126d0585a929bc073a31aaaa9984c78cf9
Author: Javier Jardón <jjardon gnome org>
Date:   Thu Feb 27 03:16:34 2014 +0000

    configure: Do not overwrite the user variable CFLAGS
    
    Also we are already setting this in gtkgl/Makefile.am:
    AM_CFLAGS = $(GTK_CFLAGS) $(GL_CFLAGS)

 configure.ac         |    2 --
 examples/Makefile.am |    1 +
 2 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4f385a8..4ff1d49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -177,8 +177,6 @@ AM_CONDITIONAL(HAVE_SHADERS, test "$have_shaders" = "yes")
 AC_SUBST(GL_CFLAGS)
 AC_SUBST(GL_LIBS)
 
-CFLAGS="$CFLAGS $GTK_CFLAGS $GL_CFLAGS"
-
 AC_CONFIG_FILES([
   Makefile
   gtkgl-2.0.pc
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 665d375..c305f44 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -9,6 +9,7 @@ endif
 noinst_PROGRAMS = simple zktor viewlw glpixmap gdkfont $(shader_programs) gtkglarea_demo
 
 AM_CPPFLAGS = -I$(top_srcdir)
+AM_CFLAGS = $(GTK_CFLAGS) $(GL_CFLAGS)
 LDADD = $(top_builddir)/gtkgl/libgtkgl-2.0.la $(GTK_LIBS) $(GL_LIBS) $(LIBM)
 
 simple_SOURCES   = simple.c