D7650: match: normalize `cwd` early

[mharbison72 (Matt Harbison)]

mharbison72 added a comment.


  In D7650#113661 <https://phab.mercurial-scm.org/D7650#113661>, @mharbison72 wrote:
  
  > This ends up making Windows unhappy.  I haven't had a chance to look into it yet.
  > https://ci.hg.gregoryszorc.com/job-info/hg-committed-5685ce2ea3bfe2f82ba0119788e2fef853bcf97a-windows-cpython-2.7-x64-0#failed-tests
  
  (The doctest failures are from D7649 <https://phab.mercurial-scm.org/D7649>.  The `../$TESTTMP` stuff is this one.)

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7650/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7650

To: martinvonz, #hg-reviewers, pulkit
Cc: mharbison72, pulkit, mercurial-devel