patch applied (ghc): Make the "show" target work anywhere in the build tree

[Ian Lynagh]

Wed Jun 16 05:29:10 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Make the "show" target work anywhere in the build tree

    M ./SUBMAKEHELP +4
    M ./mk/sub-makefile.mk -1 +5

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100616122910-3fd76-cc11699df501663bc1989e1f3fed5770edffc280.gz