Upgrade: fixed SO_NOSIGPIPE on socketpair.
Upgrade: fixed SO_NOSIGPIPE on socketpair.

ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd