[release-notes] Fix building when srcdir != builddir

[Link Dupont <link src gnome org>]

commit 2f63243801fb0155e528a88afbd0001425812c20
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Jul 23 17:29:59 2021 +0200

    Fix building when srcdir != builddir
    
    This allows us to build the release notes using the default jhbuild
    configuration.
    
    Fixes: 768a7560b38ae1c838a8e7f8d02e08897880f515

 help/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/Makefile.am b/help/Makefile.am
index 606b78a2..51dbc159 100644
--- a/help/Makefile.am
+++ b/help/Makefile.am
@@ -13,4 +13,4 @@ HELP_MEDIA = \
  figures/gtk.png \
  figures/placeholder.png
 
-HELP_LINGUAS = $(shell cat LINGUAS | sed '/^#/d')
+HELP_LINGUAS = $(shell cat $(srcdir)/LINGUAS | sed '/^#/d')