Revert "netatalk: update to version 3.1.13"

We received a report from Turris user on Turris support department that
netatalk version 3.1.13 does not work properly.

Process afpd says: INTERNAL ERROR Signal 11
because of that Apple Time Machine does not work as it should

This was already reported to netatalk by different people on various
GNU/Linux distributions like CentOS, AlmaLinux [1] [2]

netatalk developer states [3]:
```
Generally, at this point I can only advice to stop using Netatalk. There
are more pending CVEs that I currently don't have the bandwidth to work on.
```

[1] https://sourceforge.net/p/netatalk/bugs/669/
[2] https://sourceforge.net/p/netatalk/bugs/670/
[3] https://sourceforge.net/p/netatalk/mailman/message/37638871/

This reverts commit 165c5625a3.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

net/netatalk/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=netatalk
-PKG_VERSION:=3.1.13
-PKG_RELEASE:=1
+PKG_VERSION:=3.1.12
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@SF/netatalk
-PKG_HASH:=89ada6bcfe1b39ad94f58c236654d1d944f2645c3e7de98b3374e0bd37d5e05d
+PKG_HASH:=1560f83a3da41be97e0b70a96e2402159b8ddc631d38538360b14784beada5d1
 
 PKG_BUILD_PARALLEL:=1
 PKG_INSTALL:=1