[gimp/wip/Jehan/pygtk-4-distcheck] Use pygobject-codegen-2.0 instead of pygtk-codegen-2.0.

[Jehan <jehanp src gnome org>]

commit 76a21061e88eea1f420d7450af6b03acbbd9b253
Author: Jehan <jehan girinstud io>
Date:   Sun Aug 2 20:59:03 2020 +0200

    Use pygobject-codegen-2.0 instead of pygtk-codegen-2.0.

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 65aedda193..33058f63f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2295,9 +2295,9 @@ m4_define([pycheck_error], [
       *** passing --disable-python to configure (but then you will not be able
       *** to use scripts for GIMP that are written in Python)."])
 
-AC_PATH_PROG(PYGTK_CODEGEN, pygtk-codegen-2.0, no)
+AC_PATH_PROG(PYGTK_CODEGEN, pygobject-codegen-2.0, no)
 AC_MSG_CHECKING(for pygtk defs)
-PYGTK_DEFSDIR=`$PKG_CONFIG --variable=defsdir pygtk-2.0`
+PYGTK_DEFSDIR=`$PKG_CONFIG --variable=defsdir pygobject-2.0`
 AC_SUBST(PYGTK_DEFSDIR)
 AC_MSG_RESULT($PYGTK_DEFSDIR)