Have cURL extension look for certificates in directory set by "openssl.capath"

Description

I'm on Windows using openssl.cafile and a cacert.pem from curl.se . I also got a local CA certificate that I use. So far I've been just editing any new cacert.pem file to add my certificate. Been working great, but wanted to test if cURL would use openssl.capath to look for it. However, it was just ignoring even with the correct filname (<certificate hash>.0), not even making any access to the directory I set. Only using CURLOPT_CAPATH in the PHP script made it look for the certificate.

Checked out branch "PHP-8.1.22" and looked into ext/curl/interface.c and did the following:

@@ -1817,6 +1817,7 @@ static void create_certinfo(struct curl_certinfo *ci, zval *listcode)
 static void _php_curl_set_default_options(php_curl *ch)
 {
 	char *cainfo;
+	char *capath;
 
 	curl_easy_setopt(ch->cp, CURLOPT_NOPROGRESS,        1);
 	curl_easy_setopt(ch->cp, CURLOPT_VERBOSE,           0);
@@ -1840,6 +1841,11 @@ static void _php_curl_set_default_options(php_curl *ch)
 	if (cainfo && cainfo[0] != '\0') {
 		curl_easy_setopt(ch->cp, CURLOPT_CAINFO, cainfo);
 	}
+	
+	capath = INI_STR("openssl.capath");
+	if (capath && capath[0] != '\0') {
+		curl_easy_setopt(ch->cp, CURLOPT_CAPATH, capath);
+	}
 
 #ifdef ZTS
 	curl_easy_setopt(ch->cp, CURLOPT_NOSIGNAL, 1);

Compiled and tested to be working.

Could also consider adding curl.capath as a setting.

Start in ext/curl/interface.c at _php_curl_set_default_options and compare the existing openssl.cafile handling with the proposed openssl.capath change. Build and test the cURL extension on Windows with a hashed certificate in the configured directory; done means cURL uses openssl.capath without requiring CURLOPT_CAPATH in the PHP script.