followup fix to pull #619

[qwcode]

this corrects the site-packages path for pypy in response to my lib_path fix.

this got the pypy failures down to 2 for me.

[pnasrat]

Great - after this goes through the build queue I'll merge.

[pnasrat]

Travis pypy run http://travis-ci.org/#!/pypa/pip/jobs/1987701

[travisbot]

This pull request fails (merged aa20274 into fa8c738).

[pnasrat]

So pypy FAILED (SKIP=12, failures=12) the other failure was network issue.

[qwcode]

hmm.... I checked again.. I only have 2 locally.
the extra ones travis are reporting are the ones where there's an expected dir like
created: .virtualenv/site-packages/initools
looking...

[travisbot]

This pull request passes (merged b7cca4e into fa8c738).

[qwcode]

still left with 12.
I think none of these are new failures

compared to where we were before: http://travis-ci.org/#!/pypa/pip/jobs/1982085

we've gone from
FAILED (SKIP=3, errors=8, failures=17)
to
FAILED (SKIP=12, failures=12)