It conflicts with libressl, which is needed for curl now.

Closes: #2348

Closes: #2358

Allow enabling devil logging in configure using the
--enable-devel-logging switch.
Doing so defines the DEVEL_LOGGING macro.

See: #2358

See: #2370

Closes: #2370

Feature: Support HTTP keep-alive for SOURCE connections if they give us a content-length (useful for pokes)

For legacy-global-source this adds POST to the list.
For legacy-mount-source this adds POST and DELETE to the list.
The lists are now sync.

Closes: #2366
Found while working on & See also: icecast-libshout#2303

This updates to the Mozilla Foundation's "Intermediate" list
as of the time of this commit.
The list is appended with several negative rules that we included
before.

Closes: #2356

Closes: #2355

Thanks to Julien CROUZET <contact@juliencrouzet.fr> for all the input!