[mm-common] skeletonmm: Doxyfile.in: Remove obsolete glibmm configuration constants

[Kjell Ahlstedt <kjellahl src gnome org>]

commit d5cf9430ae338686f959d5071fced435ab8780b6
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Mar 22 10:48:03 2019 +0100

    skeletonmm: Doxyfile.in: Remove obsolete glibmm configuration constants
    
    They have been removed from glibmm's master branch. They shall not be used
    in new code. See issue glibmm#22.

 skeletonmm/doc/reference/Doxyfile.in | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/skeletonmm/doc/reference/Doxyfile.in b/skeletonmm/doc/reference/Doxyfile.in
index 82dd703..8f0147f 100644
--- a/skeletonmm/doc/reference/Doxyfile.in
+++ b/skeletonmm/doc/reference/Doxyfile.in
@@ -298,10 +298,6 @@ 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 \
                          "SKELETONMM_API="
 EXPAND_AS_DEFINED      = SKELETONMM_MAJOR_VERSION \
                          SKELETONMM_MINOR_VERSION \