Do case-insensitive diffs as the test is sensitive as to whether 0x0 is printed
as (null) or (NULL).

Upstream-Status: Submitted [https://gitlab.gnome.org/GNOME/pango/merge_requests/44]
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/tests/markup-parse.c b/tests/markup-parse.c
index 633f3e89..36d2c776 100644
--- a/tests/markup-parse.c
+++ b/tests/markup-parse.c
@@ -217,7 +217,7 @@ diff_with_file (const char  *file1,
                 GString     *string,
                 GError     **error)
 {
-  const char *command[] = { "diff", "-u", file1, NULL, NULL };
+  const char *command[] = { "diff", "-u", "-i", file1, NULL, NULL };
   char *diff, *tmpfile;
   int fd;
 
@@ -237,7 +237,7 @@ diff_with_file (const char  *file1,
       goto done;
     }
   close (fd);
-  command[3] = tmpfile;
+  command[4] = tmpfile;
 
   /* run diff command */
   g_spawn_sync (NULL, (char **)command, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, &diff, NULL, NULL, error);