Avoid -Wmisleading-indentation warnings with GCC 6.

GCC 6 warns about potentially misleading indentation, such as:

    if (condition) stmt1; stmt2;

Chaining multiple ifs on a single line runs into this warning, even if
it's probably not actually misleading to a human eye, so just add a
couple of newlines to pacify the compiler.

cproxy.c

@@ -173,7 +173,8 @@ int proxy_socks5_selectchap(Proxy_Socket p)
 	chapbuf[5] = '\x02'; /* Second attribute - username */
 
 	ulen = strlen(username);
-	if (ulen > 255) ulen = 255; if (ulen < 1) ulen = 1;
+	if (ulen > 255) ulen = 255;
+	if (ulen < 1) ulen = 1;
 
 	chapbuf[6] = ulen;
 	memcpy(chapbuf+7, username, ulen);

proxy.c

@@ -1246,9 +1246,11 @@ int proxy_socks5_negotiate (Proxy_Socket p, int change)
 		char userpwbuf[255 + 255 + 3];
 		int ulen, plen;
 		ulen = strlen(username);
-		if (ulen > 255) ulen = 255; if (ulen < 1) ulen = 1;
+		if (ulen > 255) ulen = 255;
+		if (ulen < 1) ulen = 1;
 		plen = strlen(password);
-		if (plen > 255) plen = 255; if (plen < 1) plen = 1;
+		if (plen > 255) plen = 255;
+		if (plen < 1) plen = 1;
 		userpwbuf[0] = 1;      /* version number of subnegotiation */
 		userpwbuf[1] = ulen;
 		memcpy(userpwbuf+2, username, ulen);