lib: fix some loose ends for recently added CURLSSLOPT_NO_PARTIALCHAIN

Add support for CURLSSLOPT_NO_PARTIALCHAIN in CURLOPT_PROXY_SSL_OPTIONS
and OS400 package spec.

Also I added the option to the NameValue list in the tool even though it
isn't exposed as a command-line option (...yet?). (NameValue stringizes
the option name for the curl cmd -> libcurl source generator)

Follow-up to 564d88a which added CURLSSLOPT_NO_PARTIALCHAIN.

Ref: https://github.com/curl/curl/pull/4655

src/tool_setopt.c

@@ -124,6 +124,7 @@ const NameValue setopt_nv_CURLUSESSL[] = {
 const NameValueUnsigned setopt_nv_CURLSSLOPT[] = {
   NV(CURLSSLOPT_ALLOW_BEAST),
   NV(CURLSSLOPT_NO_REVOKE),
+  NV(CURLSSLOPT_NO_PARTIALCHAIN),
   NVEND,
 };