Made the win32 socket error reporting also handle regular system errors

Changes

@@ -3228,3 +3228,5 @@ This is the 3.2 fixes branch.
   LinDevel
 - Added /dns c to clear the DNS cache (#0001852) suggested by samson.
 - Seems I forgot to del_Command() SPAMFILTER and TEMPSHUN.
+- Made the win32 socket error reporting also handle regular system errors (#0001851) 
+  reported by Troco

src/support.c

@@ -2330,6 +2330,7 @@ struct u_WSA_errors WSAErrors[] = {
 
 char *sock_strerror(int error)
 {
+	static char unkerr[64];
 	int start = 0;
 	int stop = sizeof(WSAErrors)/sizeof(WSAErrors[0])-1;
 	int mid;
@@ -2337,6 +2338,9 @@ char *sock_strerror(int error)
 	if (!error) /* strerror compatibility */
 		return NULL;
 
+	if (error < WSABASEERR) /* Just a regular error code */
+		return strerror(error);
+
 	/* Microsoft decided not to use sequential numbers for the error codes,
 	 * so we can't just use the array index for the code. But, at least
 	 * use a binary search to make it as fast as possible. 
@@ -2352,6 +2356,7 @@ char *sock_strerror(int error)
 		else
 			return WSAErrors[mid].error_string;	
 	}
-	return NULL;
+	sprintf(unkerr, "Unknown Error: %d", error);
+	return unkerr;
 }
 #endif