contrib: integrate RPM spec

Remove OpenSUSE bug report link, set version to 0.0.0, make it build with CentOS 8 etc.

Related: OS#4550
Change-Id: Ibf21cfd2ea3f3d0def3c18374118c4cb03a45e05
diff --git a/contrib/gapk.spec b/contrib/gapk.spec
index 3f076cc..a2a65e2 100644
--- a/contrib/gapk.spec
+++ b/contrib/gapk.spec
@@ -12,15 +12,12 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
-#
-
 %define with_amr 1
 %define with_gsmhr 1
 %define sover 0
 
 Name:           gapk
-Version:        0.4.79
+Version:        0.0.0
 Release:        0
 Summary:        GSM Audio Pocket Knife
 License:        GPL-3.0-only