Remove custom CA certs

The included collection of CA certificates has not been updated since
2021, which means it's outdated and possibly a security risk. Also it
should not be necessary, as curl is able to find the system installed CA
certs which is more likely to be up to date and safer.

include/network.php

@@ -13,15 +13,6 @@ use Zotlabs\Web\HTTPSig;
  * @brief Network related functions.
  */
 
-/**
- * @brief Returns path to CA file.
- *
- * @return string
- */
-function get_capath() {
-	return appdirpath() . '/library/cacert.pem';
-}
-
 /**
  * @brief fetches an URL.
  *
@@ -63,7 +54,6 @@ function z_fetch_url($url, $binary = false, $redirects = 0, $opts = array()) {
 
 	@curl_setopt($ch, CURLOPT_HEADER, true);
 	@curl_setopt($ch, CURLINFO_HEADER_OUT, true);
-	@curl_setopt($ch, CURLOPT_CAINFO, get_capath());
 	@curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
 	@curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
 	@curl_setopt($ch, CURLOPT_ENCODING, '');
@@ -262,7 +252,6 @@ function z_post_url($url, $params, $redirects = 0, $opts = array()) {
 
 	@curl_setopt($ch, CURLOPT_HEADER, true);
 	@curl_setopt($ch, CURLINFO_HEADER_OUT, true);
-	@curl_setopt($ch, CURLOPT_CAINFO, get_capath());
 	@curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
 	@curl_setopt($ch, CURLOPT_POST,1);
 	@curl_setopt($ch, CURLOPT_POSTFIELDS,$params);