[atkmm] Doxyfile.in: Remove obsolete glibmm configuration constants

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 4a6283768ba273df87c758b8b4093e3acc2dd9ca
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Mar 21 16:09:43 2019 +0100

    Doxyfile.in: Remove obsolete glibmm configuration constants
    
    They have been removed from glibmm. See issue glibmm#22.

 doc/reference/Doxyfile.in | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/doc/reference/Doxyfile.in b/doc/reference/Doxyfile.in
index 7f2717a..0bff6f0 100644
--- a/doc/reference/Doxyfile.in
+++ b/doc/reference/Doxyfile.in
@@ -297,10 +297,6 @@ PREDEFINED             = __cplusplus \
                          "G_GNUC_PURE=" \
                          "G_GNUC_WARN_UNUSED_RESULT=" \
                          "G_MODULE_EXPORT=" \
-                         GLIBMM_DEFAULT_SIGNAL_HANDLERS_ENABLED \
-                         GLIBMM_EXCEPTIONS_ENABLED \
-                         GLIBMM_PROPERTIES_ENABLED \
-                         GLIBMM_VFUNCS_ENABLED \
                          "ATKMM_API="
 EXPAND_AS_DEFINED      = ATKMM_MAJOR_VERSION \
                          ATKMM_MINOR_VERSION \