Fix cmake warning and msvc debug asserts

[asfimport]

• Fix dependency target for "arrow_objlib".
• Fix debug asserts in tests.

Environment: windows \ msvc
Reporter: Renat Valiullin / @rip-nsk
Assignee: Renat Valiullin / @rip-nsk

_{Note: This issue was originally created as ARROW-1057. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 706
#706