Fix 30s hang->timeout when closing a socket with no more data

Fix 30s timeout when closing a socket that has no remaining data, introduced in 375950f6; setting the socket nonblocking makes recv() return instantly but not select()

Winsock2.h included after windows.h

Fixed an error in mongoose.c that caused a lot of errors where winsock2.h was included after windows.h

Add mime type for .xsl

Add default MIME type for xsl