[PATCH v2 0/2] Stop using CMAKE_HAVE_THREADS_LIBRARY in the build system

[Raphael Kubo da Costa <rakuco@xxxxxxxxxxx>]

Sorry that it took so long to get back to this patch series.

Patch 1 is exactly the same, and patch 2 has been reworked to address
Andreas' comments: it is much shorter, and only changes the
CMAKE_HAVE_THREADS_LIBRARY check to less strict one.

As I mention in the commit message, it is important to notice that if one is
building libssh on some exotic platform that does not have pthreads the
configuration will fail because CMake will try to create a libssh_threads
target but won't have any source files to use (this is intended from what I
could understand from our previous thread).

Cheers.