[gimp] configure.ac: Correct detection of `xgettext`

[Jehan <jehanp src gnome org>]

commit e5157f9894fa6e84095668b31f5f4a4bec71b206
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Mon Dec 13 16:18:04 2021 +0000

    configure.ac: Correct detection of `xgettext`
    
    On macOS at least, `xgettext` is not being correctly identified because
    `AM_GLIB_GNU_GETTEXT` is blowing away `XGETTEXT` variable which then
    messes up the version checking.
    
    This moves that macro to after the version check.

 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index b05ed166cd..130de55130 100644
--- a/configure.ac
+++ b/configure.ac
@@ -667,7 +667,6 @@ m4_define([add_deps_error], [
 ######################
 
 IT_PROG_INTLTOOL(intltool_required_version)
-AM_GLIB_GNU_GETTEXT
 
 # Testing xgettext version since we had some problem with localizing script-fu. See bug 720052.
 AC_MSG_CHECKING([for xgettext version (>= xgettext_required_version)])
@@ -696,6 +695,8 @@ if test "x$have_required_xgettext" = "xno"; then
     add_deps_error([xgettext], [xgettext >= xgettext_required_version])
 fi
 
+AM_GLIB_GNU_GETTEXT
+
 ###########
 # iso-codes
 ###########