Changes

libmicrohttpd: removed unneeded old workarounds

Several changes:
* Dropped unneeded rebuild of autotools files
* Removed enforcement of '-lnsl -lsocket' libs, they are detected
automatically by configure
* Removed forced fallback to socketpair instead of EventFD. EventFD has
long been fixed in the illumos kernel, fallback is not needed anymore.
* Removed disable of epoll functionality. epoll has long been fixed
in the illumos kernel, disable is not needed anymore.
* Added configure option to ensure that HTTPS is detected and built.
* Removed not needed libgcrypt library. It was required for proper
initialisation of GnuTLS in early 2.x days.
 (commit: f945817)