[gimp] plug-ins: fix file-jp2-load build.

[Jehan <jehanp src gnome org>]

commit b8d1046aa9bdab2de556eb1f5a53ff39a45e3155
Author: Jehan <jehan girinstud io>
Date:   Sun Jun 5 02:32:38 2022 +0200

    plug-ins: fix file-jp2-load build.
    
    I guess I missed this one as I was not building it locally.
    Fixes:
    
    > In file included from ../plug-ins/common/file-jp2-load.c:86:
    > ../plug-ins/common/file-jp2-load.c: In function ‘jp2_class_init’:
    > ../libgimp/stdplugins-intl.h:42:22: error: ‘set_i18n’ undeclared (first use in this function)

 plug-ins/common/file-jp2-load.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/plug-ins/common/file-jp2-load.c b/plug-ins/common/file-jp2-load.c
index e6b8035492..7077e1b16d 100644
--- a/plug-ins/common/file-jp2-load.c
+++ b/plug-ins/common/file-jp2-load.c
@@ -139,6 +139,7 @@ static OPJ_COLOR_SPACE  open_dialog          (GFile               *file,
 G_DEFINE_TYPE (Jp2, jp2, GIMP_TYPE_PLUG_IN)
 
 GIMP_MAIN (JP2_TYPE)
+DEFINE_STD_SET_I18N
 
 
 static void