D328: setup: Fix installing in a mingw environment

[quark (Jun Wu)]

quark requested changes to this revision.
quark added a comment.
This revision now requires changes to proceed.


  https://phab.mercurial-scm.org/D329 is a replacement. Maybe abandon this diff then.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D328

To: glandium, #hg-reviewers, quark
Cc: quark, mercurial-devel