Latest Apple clang (v13) defines __cplusplus=199711 by default, but
protobuf requires at least 201103 (c++11)

Backported patch to fix c++ detection:
30fe936a88

Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>

Removed upstreamed patches.

Refreshed other ones.

Removed Makefile hacks.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

This package does not currently compile.

This is needed to do so that it compiles:
- fix emptying CXX variable in configure script
- fix automake not generating Makefile (remove doxygen definitions)
- force gnu++11 by patch, does not work with configure variable
Also because of changed API in libmicrohttpd:
- fix HttpServer

Moreover this package does not support --disable-slp configure option
anymore, remove it.

Signed-off-by: Marek Behún <kabel@blackhole.sk>