VERSION: Disable GIT_SNAPSHOT for the 4.12.4 release.

VERSION: Disable GIT_SNAPSHOT for the 4.12.4 release.

This is a security release in order to address the following CVEs:

o CVE-2020-10730: NULL pointer de-reference and use-after-free in Samba AD DC
                  LDAP Server with ASQ, VLV and paged_results.
o CVE-2020-10745: Parsing and packing of NBT and DNS packets can consume
                  excessive CPU.
o CVE-2020-10760: LDAP Use-after-free in Samba AD DC Global Catalog with
                  paged_results and VLV.
o CVE-2020-14303: Empty UDP packet DoS in Samba AD DC nbtd.

Signed-off-by: Karolin Seeger <kseeger@samba.org>