Revert the fallback hostname revert

Sadly, this does not work.

It seems NM queries resolved for the local IP address and gets "linux"
and sets that as the transient hostname. Resolved has a "fallback hostname"
(that will now again be "fedora"), but it also has a fallback fallback hostname
that is "linux" that it used in reverse dns queries and such. NM gets
the "linux" name and tells hostnamed to use that as the transient hostname.
I don't think this is an improvement, since "linux" is a problematic
as "fedora". So let's revert this for now to avoid pointless churn,
until we figure out a real solution.

systemd.spec

@@ -21,7 +21,7 @@
 Name:           systemd
 Url:            https://www.freedesktop.org/wiki/Software/systemd
 Version:        246.7
-Release:        1%{?dist}
+Release:        2%{?dist}
 # For a breakdown of the licensing, see README
 License:        LGPLv2+ and MIT and GPLv2+
 Summary:        System and Service Manager
@@ -432,6 +432,7 @@ CONFIGURE_OPTS=(
         -Db_ndebug=false
         -Dman=true
         -Dversion-tag=v%{version}-%{release}
+        -Dfallback-hostname=fedora
         -Ddefault-dnssec=no
         # https://bugzilla.redhat.com/show_bug.cgi?id=1867830
         -Ddefault-mdns=no
@@ -878,6 +879,9 @@ getent passwd systemd-network &>/dev/null || useradd -r -u 192 -l -g systemd-net
 %files standalone-sysusers -f .file-list-standalone-sysusers
 
 %changelog
+* Tue Dec  8 2020 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 246.7-2
+- Rebuild with fallback hostname change reverted.
+
 * Tue Dec  8 2020 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 246.7-1
 - Update to latest stable release. Unfortunately this contains
   a fairly large number of patches for a stable release (180+).