Declare gtk_icon_size_lookup if it is missing from the GTK+ headers (Bug 1177079)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34629 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -2724,6 +2724,25 @@ libraries returned by 'pkg-config gtk+-2.0 --libs' or 'gtk-config
             LIBS="$LIBS $wx_cv_libs_gtk"
             
             AC_CHECK_FUNCS([pango_font_family_is_monospace])
+
+            dnl gtk_icon_size_lookup is not available in the GTK+ headers
+            dnl that have shipped with some versions of Sun's JDS. Not using
+            dnl AC_CHECK_FUNCS here since it only checks the function exists
+            dnl in the lib (not the header).
+            AC_MSG_CHECKING([if gtk_icon_size_lookup is missing])
+            AC_TRY_COMPILE([
+                            #include <gtk/gtk.h>
+                           ],
+                           [
+                            void *f = gtk_icon_size_lookup;
+                           ],
+                           [
+                            AC_MSG_RESULT([no])
+                           ],
+                           [
+                            AC_DEFINE(NEED_GTK_ICON_SIZE_LOOKUP)
+                            AC_MSG_RESULT([yes])
+                           ])
             
             dnl test if we have at least GTK+ 2.4:
             AC_MSG_CHECKING([if GTK+ is version >= 2.4])