gtk: use a more sensibly unique version define

vcl/Library_vclplug_gtk.mk

@@ -38,7 +38,7 @@ $(eval $(call gb_Library_set_include,vclplug_gtk,\
 
 $(eval $(call gb_Library_add_defs,vclplug_gtk,\
     -DVCLPLUG_GTK_IMPLEMENTATION \
-    -DVERSION=\"$(UPD)$(LAST_MINOR)\" \
+    -DLIBO_VERSION=\"$(UPD)$(LAST_MINOR)\" \
 ))
 
 $(eval $(call gb_Library_add_api,vclplug_gtk,\

vcl/Library_vclplug_gtk3.mk

@@ -43,7 +43,7 @@ $(eval $(call gb_Library_add_cxxflags,vclplug_gtk3,\
 
 $(eval $(call gb_Library_add_defs,vclplug_gtk3,\
     -DVCLPLUG_GTK_IMPLEMENTATION \
-    -DVERSION=\"$(UPD)$(LAST_MINOR)\" \
+    -DLIBO_VERSION=\"$(UPD)$(LAST_MINOR)\" \
 ))
 
 $(eval $(call gb_Library_add_api,vclplug_gtk3,\

vcl/unx/gtk/a11y/atkutil.cxx

@@ -704,8 +704,7 @@ ooo_atk_util_get_toolkit_version (void)
      * Version is passed in as a -D flag when this file is
      * compiled.
      */
-
-    return VERSION;
+    return LIBO_VERSION;
 }
 
 /*****************************************************************************/