refactor: network - harden TCP/IP and unify HTTP clients

programs/include/tls/tls.hpp

@@ -23,6 +23,7 @@ struct TrustAnchors {
 };
 
 TrustAnchors load_trust_anchors();
+void free_trust_anchors(TrustAnchors* tas);
 void get_bearssl_time(uint32_t* days, uint32_t* seconds);
 int tls_send_all(int fd, const unsigned char* data, size_t len);
 int tls_recv_some(int fd, unsigned char* buf, size_t maxlen);