test1939: require proxy support to run

Follow-up to f0b7099a10d1a

Closes #8011

multi: shut down CONNECT in Curl_detach_connnection

... to prevent a lingering pointer that would lead to a double-free.

Added test 1939 to verify.

Reported-by: Stephen M.

multi: shut down CONNECT in Curl_detach_connnection

... to prevent a lingering pointer that would lead to a double-free.

Added test 1939 to verify.

Reported-by: Stephen M. Coakley
Fixes #7982
Closes #7986

show more ...