Buck: Make deps to $(exe :foo) and $(location :bar) implicitly

Apply [1] on our Buck tree.

[1] https://github.com/facebook/buck/issues/128

Change-Id: Ie3a9de0b2ee3725170bcbd06df059ea5d9ae5252

plugins/BUCK

@@ -33,7 +33,6 @@ genrule(
     ';do ln -s $s $TMP/WEB-INF/plugins;done;' +
     'cd $TMP;' +
     'zip -qr $OUT .',
-  deps = ['//%s/%s:%s' % (BASE, n, n) for n in HAVE],
   out = 'core.zip',
   visibility = ['//:release'],
 )