update_unicode.sh: pin the uniset repo to a known good commit

The uniset upstream has added more commits that for example change the
hexadecimal output in '--32' mode to decimal. Let's pin the repo to a
commit that still outputs the width tables in the format we want.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/update-unicode/update_unicode.sh

@@ -15,7 +15,8 @@ if ! test -f EastAsianWidth.txt; then
 	wget http://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt
 fi &&
 if ! test -d uniset; then
-	git clone https://github.com/depp/uniset.git
+	git clone https://github.com/depp/uniset.git &&
+	( cd uniset && git checkout 4b186196dd )
 fi &&
 (
 	cd uniset &&