curl: fix integer variable typechecks with curl_easy_setopt()

As discussed in the previous commit, we should be passing long integers,
not regular ones, to curl_easy_setopt(), and compiling against curl 8.14
loudly complains if we don't.

That patch fixed integer constants by adding an "L". This one deals with
actual variables.

Arguably these variables could just be declared as "long" in the first
place. But it's actually kind of awkward due to other code which uses
them:

  - port is conceptually a short, and we even call htons() on it (though
    weirdly it is defined as a regular int).

  - ssl_verify is conceptually a bool, and we assign to it from
    git_config_bool().

So I think we could probably switch these out for longs without hurting
anything, but it just feels a bit weird. Doubly so because if you don't
set USE_CURL_FOR_IMAP_SEND set, then the current types are fine!

So let's just cast these to longs in the curl calls, which makes what's
going on obvious. There aren't that many spots to modify (and as you can
see from the context, we already have some similar casts).

Backported-from: 30325e2 (curl: fix integer variable typechecks with curl_easy_setopt(), 2025-06-04)
Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>

Author: peff

imap-send.c

@@ -1418,7 +1418,7 @@ static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
 
 	curl_easy_setopt(curl, CURLOPT_URL, path.buf);
 	strbuf_release(&path);
-	curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
+	curl_easy_setopt(curl, CURLOPT_PORT, (long)srvc->port);
 
 	if (srvc->auth_method) {
 		struct strbuf auth = STRBUF_INIT;
@@ -1431,8 +1431,8 @@ static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
 	if (!srvc->use_ssl)
 		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
 
-	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
-	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, (long)srvc->ssl_verify);
+	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, (long)srvc->ssl_verify);
 
 	curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);