Removing an unused static prototype declaration

[trivial, not reviewed]

In developer mode on the Mac anyway, the removal of findLocaleLookup()
without removing its prototype resulted in a broken compile.  The
routine looks like it got removed today, so I'm removing the prototype
as well.



git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@21815 3a8e244f-b0f2-452b-bcba-4c88e055c3ca