curl: make --libcurl output better CURLOPT_*SSLVERSION

The option is really two enums ORed together, so it needs special
attention to make the code output nice.

Added test 1481 to verify. Both the server and the proxy versions.

Reported-by: Boris Verkhovskiy
Fixes #13127
Closes #13129

tests/data/test1481

@@ -0,0 +1,118 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+--libcurl
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Thu, 29 Jul 2008 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 0
+Connection: close
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<features>
+proxy
+ssl
+</features>
+<name>
+--libcurl with TLS version options
+</name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
+<command>
+http://moo/ --libcurl %LOGDIR/test%TESTNUMBER.c --tls-max 1.3 --proxy-tlsv1 -x http://%HOSTIP:%HTTPPORT
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+GET http://moo/ HTTP/1.1
+Host: moo
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+<stripfile>
+s/(USERAGENT, \")[^\"]+/${1}stripped/
+# CURLOPT_SSL_VERIFYPEER, SSH_KNOWNHOSTS and HTTP_VERSION vary with
+# CURLOPT_INTERLEAVEDATA requires RTSP protocol
+# configurations - just ignore them
+$_ = '' if /CURLOPT_SSL_VERIFYPEER/
+$_ = '' if /CURLOPT_SSH_KNOWNHOSTS/
+$_ = '' if /CURLOPT_HTTP_VERSION/
+$_ = '' if /CURLOPT_HTTP09_ALLOWED/
+$_ = '' if /CURLOPT_INTERLEAVEDATA/
+</stripfile>
+<file name="%LOGDIR/test%TESTNUMBER.c" mode="text">
+/********* Sample code generated by the curl command line tool **********
+ * All curl_easy_setopt() options are documented at:
+ * https://curl.se/libcurl/c/curl_easy_setopt.html
+ ************************************************************************/
+#include <curl/curl.h>
+
+int main(int argc, char *argv[])
+{
+  CURLcode ret;
+  CURL *hnd;
+
+  hnd = curl_easy_init();
+  curl_easy_setopt(hnd, CURLOPT_BUFFERSIZE, 102400L);
+  curl_easy_setopt(hnd, CURLOPT_URL, "http://moo/");
+  curl_easy_setopt(hnd, CURLOPT_PROXY, "http://%HOSTIP:%HTTPPORT");
+  curl_easy_setopt(hnd, CURLOPT_USERAGENT, "stripped");
+  curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L);
+  curl_easy_setopt(hnd, CURLOPT_SSLVERSION, (long)(CURL_SSLVERSION_DEFAULT | CURL_SSLVERSION_MAX_TLSv1_3));
+  curl_easy_setopt(hnd, CURLOPT_PROXY_SSLVERSION, (long)(CURL_SSLVERSION_TLSv1 | CURL_SSLVERSION_MAX_NONE));
+  curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
+%if ftp
+  curl_easy_setopt(hnd, CURLOPT_FTP_SKIP_PASV_IP, 1L);
+%endif
+  curl_easy_setopt(hnd, CURLOPT_TCP_KEEPALIVE, 1L);
+
+  /* Here is a list of options the curl code used that cannot get generated
+     as source easily. You may choose to either not use them or implement
+     them yourself.
+
+  CURLOPT_WRITEDATA was set to an object pointer
+  CURLOPT_WRITEFUNCTION was set to a function pointer
+  CURLOPT_READDATA was set to an object pointer
+  CURLOPT_READFUNCTION was set to a function pointer
+  CURLOPT_SEEKDATA was set to an object pointer
+  CURLOPT_SEEKFUNCTION was set to a function pointer
+  CURLOPT_ERRORBUFFER was set to an object pointer
+  CURLOPT_STDERR was set to an object pointer
+  CURLOPT_DEBUGFUNCTION was set to a function pointer
+  CURLOPT_DEBUGDATA was set to an object pointer
+  CURLOPT_HEADERFUNCTION was set to a function pointer
+  CURLOPT_HEADERDATA was set to an object pointer
+
+  */
+
+  ret = curl_easy_perform(hnd);
+
+  curl_easy_cleanup(hnd);
+  hnd = NULL;
+
+  return (int)ret;
+}
+/**** End of sample code ****/
+</file>
+</verify>
+</testcase>