nqptp: Update to version 1.2.4

nqptp: Update to version 1.2.4

- Update from version commit ad384f9ed3b2cc31e97012ab6bfe5a214ffc65a2 (between 1.2.1 and
   1.2.2) to 1.2.4
- Update of rootfile not required
- Changelog
    1.2.4
	Following on from the security update of 1.2.3, some further changes are
	 introduced to make the communication path between NQPTP and Shairport Sync
	 resistant to outside interference. On Linux, nqptp now runs as a restricted user
	 but with special permission to access ports 319 and 320.
	These changes have necessitated changing the SMI interface. The SMI interface is
	 now at version 10, and Shairport Sync must also be updated to be compatible with
	 it.
	Before updating, it is important that you remove the startup service file as
	 described in the README.
	Please read the Release Notes for more details.
    1.2.3
	This important update fixes a crashing bug whereby a maliciously-crafted message
	 to the control port could crash NQPTP. (Supersedes 1.2.2.)
    1.2.2
	Superseded by version 1.2.3

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>