[gtk/ebassi/make-npot-its] Tell xgettext to use gtk4builder.its

[Emmanuele Bassi <ebassi src gnome org>]

commit 459e0f2ccf842c186b3fbb0e21d4a747d993aa3a
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Mar 1 18:51:10 2022 +0000

    Tell xgettext to use gtk4builder.its
    
    When running xgettext inside `make-npot` we should tell it to use the
    ITS file we provide, instead of the system one.

 make-pot | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/make-pot b/make-pot
index ad3c3ad97a..230539201c 100755
--- a/make-pot
+++ b/make-pot
@@ -42,6 +42,7 @@ fi
 
 $XGETTEXT --default-domain="$GETTEXT_PACKAGE" \
           --directory="$top_srcdir" \
+          --its="$top_srcdir/tools/gtk4builder.its" \
           --msgid-bugs-address="https://gitlab.gnome.org/GNOME/gtk/-/issues/"; \
           --add-comments \
           $XGETTEXT_KEYWORDS \