Make scripts/update_tz.sh work on macOS

This is the same fix as for the main update script:
https://chromium-review.googlesource.com/c/chromium/deps/icu/+/6574134

This is enough to make this script run to completion.

Change-Id: Iab2cbab23b23337a6b3f428ce3294e6a5f523c64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/6578347
Reviewed-by: David Yeung <dayeung@chromium.org>
diff --git a/scripts/update_tz.sh b/scripts/update_tz.sh
index 71f4319..faafc88 100755
--- a/scripts/update_tz.sh
+++ b/scripts/update_tz.sh
@@ -35,7 +35,7 @@
 echo "Extracting timezone files from main to ICU tree root"
 for file in metaZones.txt timezoneTypes.txt windowsZones.txt zoneinfo64.txt
 do
-  tar -xf $tarball -C $treeroot "icu-main/icu4c/${datapath}/${file}" --strip-components=2
+  tar -xf $tarball -C $treeroot --strip-components=2 "icu-main/icu4c/${datapath}/${file}"
 done
 
 echo "Cleaning up tmp directory"