Log Message:
Update libmicrohttpd to 0.9.48:

Fri Dec 18 15:54:50 CET 2015
	Releasing libmicrohttpd 0.9.48. -CG

Tue Dec  15 18:35:55 CET 2015
	Improved compatibility with VS2010 and other older
	compilers. -EG

Tue Dec  8 21:48:44 CET 2015
	Default backlog size for listen socket was changed from
	32 to SOMAXCONN, added new option MHD_OPTION_LISTEN_BACKLOG_SIZE
	to override default backlog size.
	If not all connections can be handled by MHD_select() than
	at least some of connections will be processed instead of
	failing without any processing.
	Fixed redefenition of FD_SETSIZE on W32 so select() will
	work with 2000 connections instead of 64.
	Better handled redefenition of FD_SETSIZE on all
	platforms. -EG

Sat Dec  5 17:30:45 CET 2015
	Close sockets more aggressively in multi-threaded
	mode (possibly relevant for idle servers). -CG