[PATCH] diff: respect --no-ext-diff with typechange

If external diff is specified through diff.external then it is used even if
`git diff --no-ext-diff` is used when there is a typechange.

Signed-off-by: Jakub Vrana <redacted>
---
 diff.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/diff.c b/diff.c
index 208096f..898d610 100644
--- a/diff.c
+++ b/diff.c

@@ -3074,6 +3074,9 @@ static void run_diff(struct diff_filepair *p, struct

diff_options *o)
 	if (o->prefix_length)
 		strip_prefix(o->prefix_length, &name, &other);
 
+	if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
+		pgm = NULL;
+
 	if (DIFF_PAIR_UNMERGED(p)) {
 		run_diff_cmd(pgm, name, NULL, attr_path,
 			     NULL, NULL, NULL, o, p);
-- 
1.7.10.msysgit.1