package/jsmin: add license hash

Partly fixes:
http://autobuild.buildroot.net/results/f0f/f0fd05ce8a8b595015baf625481b58967df53458/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/jsmin/jsmin.hash

@@ -1,2 +1,3 @@
 # Locally calculated
 sha256 aae127bf7291a7b2592f36599e5ed6c6423eac7abe0cd5992f82d6d46fe9ed2d  jsmin-1bf6ce5f74a9f8752ac7f5d115b8d7ccb31cfe1b.tar.gz
+sha256 b420f61778af09534adc836a5086f5625b8499124051c50baefa218e7c03a58c  jsmin.c