[CI/Packaging] Update scripts to build against vendored jemalloc

[asfimport]

Reporter: Krisztian Szucs / @kszucs
Assignee: Krisztian Szucs / @kszucs

PRs and other links:

• GitHub Pull Request #2779

_{Note: This issue was originally created as ARROW-3539. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
I'm confused about what is required here. -DARROW_JEMALLOC=ON is the default

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 2779
#2779