dist: enable more features for distcheck

As a bare minimum we want to ensure that are releases are able to build
with support for gles1, gles2, gl, egl and glx. Previously we only
checked the build with gl + glx enabled and our last release actually
missed a header file required for building with egl.

Makefile.am

@@ -16,6 +16,14 @@ EXTRA_DIST = \
 CLEANFILES=
 DISTCLEANFILES=
 
-DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-maintainer-flags --enable-profile
+DISTCHECK_CONFIGURE_FLAGS = \
+	--enable-gtk-doc \
+	--enable-maintainer-flags \
+	--enable-profile \
+	--enable-gles1 \
+	--enable-gles2 \
+	--enable-gl \
+	--enable-xlib-egl-platform \
+	--enable-glx
 
 include $(top_srcdir)/build/autotools/Makefile.am.release

doc/RELEASING

@@ -21,7 +21,7 @@ When making a new release;
 
  - Run:
 
-     $ ./autogen.sh --enable-gtk-doc --enable-profile
+     $ ./autogen.sh --enable-gtk-doc --enable-profile --enable-gles1 --enable-gles2 --enable-gl --enable-xlib-egl-platform --enable-glx
      $ make all
      $ make install