Always skip included intl, otherwise the build fails if gettext isn't
installed even if we never link against it.

--- Makefile.in.orig	2023-08-03 01:40:16 UTC
+++ Makefile.in
@@ -469,7 +469,7 @@ target_alias = @target_alias@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-SUBDIRS = intl src po macros $(am__append_1)
+SUBDIRS = src po macros $(am__append_1)
 libdatadir = $(datarootdir)/$(PACKAGE)-$(API)
 libdata_DATA = \
 	data/conjugation-fr.xml \
