Linker::makeLinkObj breaks unit test, replace with link()

Linker::makeLinkObj was deprecated in MW 1.21, use link() instead
(since MW 1.16)

@see http://svn.wikimedia.org/doc/classLinker.html#a719aa9d10d878fa2936aeed7f692e8e1

Change-Id: I8e7406419e19b75dd041b04e407db97c35ccef12
Merge "Linker::makeLinkObj breaks unit test, replace with link()"