[C++] bz2 / zstd tests not enabled

[asfimport]

When passing -DARROW_WITH_ZSTD=on and -DARROW_WITH_BZ2=on, the relevant tests in arrow-compression-test and arrow-io-compressed-test are still not enabled.

Reporter: Antoine Pitrou / @pitrou
Assignee: Wes McKinney / @wesm

PRs and other links:

• GitHub Pull Request #5635

_{Note: This issue was originally created as ARROW-6864. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
cc @wesm

[asfimport]

Wes McKinney / @wesm:
Probably caused by my change to the flags. I'll take a look

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 5635
#5635