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

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 486e0ff54a58253fc1de9be3aa2b48156b2c6d6b
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Mar 22 11:05:10 2019 +0100

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

 docs/reference/Doxyfile.in | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)
---
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index 00d756e0..da00345a 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -302,15 +302,10 @@ PREDEFINED             = __cplusplus \
                          "G_GNUC_NORETURN=" \
                          "G_GNUC_NULL_TERMINATED=" \
                          "G_GNUC_PURE=" \
-                         GLIBMM_DEFAULT_SIGNAL_HANDLERS_ENABLED \
-                         GLIBMM_EXCEPTIONS_ENABLED \
                          GLIBMM_HAVE_WIDE_STREAM \
-                         GLIBMM_PROPERTIES_ENABLED \
-                         GLIBMM_VFUNCS_ENABLED \
                          "GDKMM_API=" \
                          "GTKMM_API=" \
-                         GTKMM_ATKMM_ENABLED \
-                         "GTKMM_USING_STD(x)="
+                         GTKMM_ATKMM_ENABLED
 EXPAND_AS_DEFINED      = GDKMM_MAJOR_VERSION \
                          GDKMM_MINOR_VERSION \
                          GDKMM_MICRO_VERSION \