url: sort the protocol schemes in rough popularity order

When looking for a protocol match among supported schemes, check the
most "popular" schemes first. It has zero functionality difference and
for all practical purposes a speed difference will not be measureable
but it still think it makes sense to put the least likely matches last.

"Popularity" based on the 2019 user survey.

Closes #5377

lib/url.c

@@ -142,19 +142,21 @@ static unsigned int get_protocol_family(unsigned int protocol);
 
 
 /*
- * Protocol table.
+ * Protocol table. Schemes (roughly) in 2019 popularity order:
+ *
+ * HTTPS, HTTP, FTP, FTPS, SFTP, FILE, SCP, SMTP, LDAP, IMAPS, TELNET, IMAP,
+ * LDAPS, SMTPS, TFTP, SMB, POP3, GOPHER POP3S, RTSP, RTMP, SMBS, DICT
  */
-
 static const struct Curl_handler * const protocols[] = {
 
-#ifndef CURL_DISABLE_HTTP
-  &Curl_handler_http,
-#endif
-
 #if defined(USE_SSL) && !defined(CURL_DISABLE_HTTP)
   &Curl_handler_https,
 #endif
 
+#ifndef CURL_DISABLE_HTTP
+  &Curl_handler_http,
+#endif
+
 #ifndef CURL_DISABLE_FTP
   &Curl_handler_ftp,
 #endif
@@ -163,12 +165,23 @@ static const struct Curl_handler * const protocols[] = {
   &Curl_handler_ftps,
 #endif
 
-#ifndef CURL_DISABLE_TELNET
-  &Curl_handler_telnet,
+#if defined(USE_SSH)
+  &Curl_handler_sftp,
 #endif
 
-#ifndef CURL_DISABLE_DICT
-  &Curl_handler_dict,
+#ifndef CURL_DISABLE_FILE
+  &Curl_handler_file,
+#endif
+
+#if defined(USE_SSH) && !defined(USE_WOLFSSH)
+  &Curl_handler_scp,
+#endif
+
+#ifndef CURL_DISABLE_SMTP
+  &Curl_handler_smtp,
+#ifdef USE_SSL
+  &Curl_handler_smtps,
+#endif
 #endif
 
 #ifndef CURL_DISABLE_LDAP
@@ -180,22 +193,6 @@ static const struct Curl_handler * const protocols[] = {
 #endif
 #endif
 
-#ifndef CURL_DISABLE_FILE
-  &Curl_handler_file,
-#endif
-
-#ifndef CURL_DISABLE_TFTP
-  &Curl_handler_tftp,
-#endif
-
-#if defined(USE_SSH) && !defined(USE_WOLFSSH)
-  &Curl_handler_scp,
-#endif
-
-#if defined(USE_SSH)
-  &Curl_handler_sftp,
-#endif
-
 #ifndef CURL_DISABLE_IMAP
   &Curl_handler_imap,
 #ifdef USE_SSL
@@ -203,6 +200,14 @@ static const struct Curl_handler * const protocols[] = {
 #endif
 #endif
 
+#ifndef CURL_DISABLE_TELNET
+  &Curl_handler_telnet,
+#endif
+
+#ifndef CURL_DISABLE_TFTP
+  &Curl_handler_tftp,
+#endif
+
 #ifndef CURL_DISABLE_POP3
   &Curl_handler_pop3,
 #ifdef USE_SSL
@@ -219,25 +224,18 @@ static const struct Curl_handler * const protocols[] = {
 #endif
 #endif
 
-#ifndef CURL_DISABLE_SMTP
-  &Curl_handler_smtp,
-#ifdef USE_SSL
-  &Curl_handler_smtps,
-#endif
-#endif
-
 #ifndef CURL_DISABLE_RTSP
   &Curl_handler_rtsp,
 #endif
 
-#ifndef CURL_DISABLE_GOPHER
-  &Curl_handler_gopher,
-#endif
-
 #ifdef CURL_ENABLE_MQTT
   &Curl_handler_mqtt,
 #endif
 
+#ifndef CURL_DISABLE_GOPHER
+  &Curl_handler_gopher,
+#endif
+
 #ifdef USE_LIBRTMP
   &Curl_handler_rtmp,
   &Curl_handler_rtmpt,
@@ -247,6 +245,10 @@ static const struct Curl_handler * const protocols[] = {
   &Curl_handler_rtmpts,
 #endif
 
+#ifndef CURL_DISABLE_DICT
+  &Curl_handler_dict,
+#endif
+
   (struct Curl_handler *) NULL
 };