[Python] Unify CMakeLists.txt at python/CMakeLists.txt and python/src/CMakeLists.txt

[asfimport]

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

Related issues:

• [Python] Pass Cmake args to Python CPP (requires)

PRs and other links:

• GitHub Pull Request #14925

_{Note: This issue was originally created as ARROW-17838. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 14925
#14925