[ARROW-12326] [C++] Avoid needless c-ares detection

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28127
• Assignee: Kouhei Sutou
• Reporter: Kouhei Sutou
• Created: 10/Apr/21 04:39
• Updated: 11/Jan/23 08:25
• Resolved: 13/Apr/21 10:50

Description

If we use system gRPC, we don't need to detect c-ares explicitly.

Issue Links

• links to: GitHub Pull Request #9977