Skip test-break when the en_US locale is missing

Just like test-layout and test-itemize.

tests/test-break.c

@@ -241,6 +241,16 @@ test_break (gconstpointer d)
   GString *dump;
   gchar *diff;
 
+  const char *old_locale = setlocale (LC_ALL, NULL);
+  setlocale (LC_ALL, "en_US.UTF-8");
+  if (strstr (setlocale (LC_ALL, NULL), "en_US") == NULL)
+    {
+      char *msg = g_strdup_printf ("Locale en_US.UTF-8 not available, skipping break %s", filename);
+      g_test_skip (msg);
+      g_free (msg);
+      return;
+    }
+
   expected_file = get_expected_filename (filename);
 
   dump = g_string_sized_new (0);
@@ -260,6 +270,8 @@ test_break (gconstpointer d)
 
   g_string_free (dump, TRUE);
   g_free (expected_file);
+
+  setlocale (LC_ALL, old_locale);
 }
 
 int
@@ -270,9 +282,6 @@ main (int argc, char *argv[])
   const gchar *name;
   gchar *path;
 
-  g_setenv ("LC_ALL", "en_US.UTF-8", TRUE);
-  setlocale (LC_ALL, "");
-
   g_test_init (&argc, &argv, NULL);
 
   context = pango_font_map_create_context (pango_cairo_font_map_get_default ());