[glibmm] Revert "Class: A use of range-based for."

[Murray Cumming <murrayc src gnome org>]

commit 021029df6c9946c3b8639bd1c8960fe98b54c50d
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Feb 23 12:48:50 2017 +0100

    Revert "Class: A use of range-based for."
    
    Because the original code starts at 1, not 0, so this was not
    equivalent.
    
    This reverts commit b0a3e10d17f21254c15781bb7ff57736a9bea569.

 glib/glibmm/class.cc |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/glib/glibmm/class.cc b/glib/glibmm/class.cc
index 7875c25..29ab8cf 100644
--- a/glib/glibmm/class.cc
+++ b/glib/glibmm/class.cc
@@ -202,11 +202,11 @@ Class::custom_class_init_function(void* g_class, void* class_data)
   gobject_class->set_property = &Glib::custom_set_property_callback;
 
   // Call extra class init functions, if any.
-  for (auto func : class_init_funcs)
+  for (std::size_t i = 1; i < class_init_funcs.size(); ++i)
   {
-    if (auto extra_init_func = std::get<GClassInitFunc>(func))
+    if (auto extra_init_func = std::get<GClassInitFunc>(class_init_funcs[i]))
     {
-      auto extra_class_data = std::get<void*>(func);
+      auto extra_class_data = std::get<void*>(class_init_funcs[i]);
       (*extra_init_func)(g_class, extra_class_data);
     }
   }