compat/mingw: drop outdated comment

This comment has been true for the longest time; The combination of the
two preceding commits made it incorrect, so let's drop that comment.

Signed-off-by: Matthias Aßhauer <mha1993@live.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: rimrul

compat/mingw.c

@@ -2588,15 +2588,6 @@ int mingw_socket(int domain, int type, int protocol)
 	ensure_socket_initialization();
 	s = WSASocket(domain, type, protocol, NULL, 0, 0);
 	if (s == INVALID_SOCKET) {
-		/*
-		 * WSAGetLastError() values are regular BSD error codes
-		 * biased by WSABASEERR.
-		 * However, strerror() does not know about networking
-		 * specific errors, which are values beginning at 38 or so.
-		 * Therefore, we choose to leave the biased error code
-		 * in errno so that _if_ someone looks up the code somewhere,
-		 * then it is at least the number that are usually listed.
-		 */
 		set_wsa_errno();
 		return -1;
 	}