Requests http_api_curl action doesn't pass $handle by reference

[pento]

The Requests compatibility layer for the http_api_curl action was introduced in [39212].

Historically, the $handle parameter has been passed by reference, but the call in WP_HTTP_Requests_Hooks::dispatch() doesn't do that.

[pento]

The test has a fake assert, because it's actually testing for a PHP error. :-)

[jnylen0]

Bringing the newer call into compliance with the existing one and the ​filter docs seems like a good idea to me.

cc @rmccue @dd32 since you worked on #37843 - one of you want to take this one for 4.7.3?

[dd32]

Since this has only been broken in 4.7.x I don't see the harm in fixing it, a pure oversight.

[dd32]

#39872 was marked as a duplicate.

[dd32]

Cross-referencing - Reporter in #39872 reports that this patch fixes the issue for them.

[dd32]

In 40068:

HTTP API: Restore backwards compatibility with the http_api_curl filter - it expects that the handle parameter is passed as a reference, however [39212] missed that.

Props pento.
Fixes #39783.

[dd32]

In 40069:

HTTP API: Restore backwards compatibility with the http_api_curl filter - it expects that the handle parameter is passed as a reference, however [39212] missed that.

Props pento.
Merges [40068] to the 4.7 branch.
Fixes #39783.