[Python] Fix manylinux1 packaging

[asfimport]

I broke this in ARROW-341

Reporter: Wes McKinney / @wesm
Assignee: Uwe Korn / @xhochy

Related issues:

• Arrow 0.3 release (blocks)

_{Note: This issue was originally created as ARROW-738. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
PR: #471

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 471
#471