ntp: drop unused POST_PATCH_HOOKS handling

Now that NTP_PATCH_FIXUPS is gone.

Reported-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ntp/ntp.mk

@@ -69,6 +69,4 @@ define NTP_INSTALL_INIT_SYSTEMD
 endef
 endif
 
-NTP_POST_PATCH_HOOKS += NTP_PATCH_FIXUPS
-
 $(eval $(autotools-package))