config: Also tokenize on equal sign.

The ssh config specifies it as a valid separator.

BUG: https://red.libssh.org/issues/166

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/config.c

@@ -128,7 +128,7 @@ static char *ssh_config_get_token(char **str) {
   c = ssh_config_get_cmd(str);
 
   for (r = c; *c; c++) {
-    if (isblank(*c)) {
+    if (isblank(*c) || *c == '=') {
       *c = '\0';
       goto out;
     }