[gimp] libgimp: update the def.

[Jehan <jehanp src gnome org>]

commit 74c69ae3c2248ff486cad321ae4fbd17d9668a1d
Author: Jehan <jehan girinstud io>
Date:   Thu Jul 25 16:58:18 2019 +0200

    libgimp: update the def.
    
    Also add a "Since: 3.0" and fix the query_proc docs.

 libgimp/gimp.c   | 2 ++
 libgimp/gimp.def | 1 +
 libgimp/gimp.h   | 2 +-
 3 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index 025485db08..2e84037d80 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -266,6 +266,8 @@ static gchar             *pdb_error_message  = NULL;
  *
  * The procedure that must be called with the PLUG_IN_INFO structure to
  * set the initialization, query, run and quit callbacks.
+ *
+ * Since: 3.0
  **/
 void
 gimp_plug_in_info_set_callbacks (GimpPlugInInfo *info,
diff --git a/libgimp/gimp.def b/libgimp/gimp.def
index 0fadcae00a..4fc5373829 100644
--- a/libgimp/gimp.def
+++ b/libgimp/gimp.def
@@ -592,6 +592,7 @@ EXPORTS
        gimp_plugin_menu_branch_register
        gimp_plugin_menu_register
        gimp_plugin_set_pdb_error_handler
+       gimp_plug_in_info_set_callbacks
        gimp_procedural_db_dump
        gimp_procedural_db_get_data
        gimp_procedural_db_get_data_size
diff --git a/libgimp/gimp.h b/libgimp/gimp.h
index 346c6814d5..43fc63b1e0 100644
--- a/libgimp/gimp.h
+++ b/libgimp/gimp.h
@@ -77,7 +77,7 @@ typedef void (* GimpInitProc)  (void);
 /**
  * GimpQuitProc:
  *
- * The quit procedure is run when GIMP closes.
+ * The quit procedure is run each time the plug-in ends.
  */
 typedef void (* GimpQuitProc)  (void);
 /**