fix: NTP syncs as soon as DHCP has a lease, random origin cookie instead of the unsynced local clock, TLS validates certificates against UTC

programs/include/montauk/syscall.h

@@ -505,6 +505,8 @@ namespace montauk {
 
     // Timekeeping (wall-clock)
     inline void gettime(montauk::abi::DateTime* out) { syscall1(montauk::abi::SYS_GETTIME, (uint64_t)out); }
+    // UTC seconds since 1970 (gettime() is local time).
+    inline int64_t get_unix_time() { return syscall0(montauk::abi::SYS_GETUNIXTIME); }
     inline int set_unix_time(int64_t unix_seconds) {
         return (int)syscall1(montauk::abi::SYS_SETUNIXTIME, (uint64_t)unix_seconds);
     }