tree-wide: never use the off_t unless glibc makes us use it

off_t is a really weird type as it is usually 64bit these days (at least
in sane programs), but could theoretically be 32bit. We don't support
off_t as 32bit builds though, but still constantly deal with safely
converting from off_t to other types and back for no point.

Hence, never use the type anymore. Always use uint64_t instead. This has
various benefits, including that we can expose these values directly as
D-Bus properties, and also that the values parse the same in all cases.

src/machine/machine-dbus.c

@@ -423,7 +423,7 @@ int bus_machine_method_get_os_release(sd_bus_message *message, void *userdata, s
                                         _exit(EXIT_FAILURE);
                         }
 
-                        r = copy_bytes(fd, pair[1], (off_t) -1, false);
+                        r = copy_bytes(fd, pair[1], (uint64_t) -1, false);
                         if (r < 0)
                                 _exit(EXIT_FAILURE);