[build] Add gtktextattributes.h

Commit 7fae37ecd54 factored out GtkTextAttributes, but did not add
the new header to the build system.

diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 06b434b78acbb3238d580ec8461c9ced69d229c6..50d7cf35a480cf1399ca99439f4c46e2ccdd502a 100644 (file)
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -305,6 +305,7 @@ gtk_public_h_sources =              \
        gtktable.h              \
        gtktearoffmenuitem.h    \
        gtktestutils.h          \
+       gtktextattributes.h     \
        gtktextbuffer.h         \
        gtktextbufferrichtext.h \
        gtktextchild.h          \