Accepting request 712606 from home:dimstar:Factory

- configs/15.5.conf: add libzstd1 to preinstall list: RPM is being
  extended to support zstd compression, which results in an
  additionaly library being linked in.


Succeeds for Staging_A - where libzstd1 is already added to preinstall

OBS-URL: https://build.opensuse.org/request/show/712606
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Tools/build?expand=0&rev=382

build.spec

@@ -20,9 +20,9 @@
 
 Name:           build
 Summary:        A Script to Build SUSE Linux RPMs
-License:        GPL-2.0-or-later AND GPL-2.0-only
+License:        GPL-2.0-only OR GPL-3.0-only
 Group:          Development/Tools/Building
-Version:        20190604
+Version:        20190627
 Release:        0
 Source:         obs-build-%{version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build