Use Microsoft magic to "ignore regular line breaks in the message definition...

Use Microsoft magic to "ignore regular line breaks in the message definition text." of socket error strings on Windows:
strips the embedded line-feeds from the socket error description.

src/xpdev/sockwrap.c

@@ -506,7 +506,7 @@ DLLEXPORT const char* socket_strerror(int error_number)
 {
 	static char msg[256];
 
-	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,	// dwFlags
+	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,	// dwFlags
 		NULL,			// lpSource
 		error_number,	// dwMessageId
 		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),    // dwLanguageId