Do not own empty directory

Each subpackage using that directory owns it. No need to own it.

json-c.spec

@@ -17,7 +17,7 @@
 
 Name:           json-c
 Version:        0.13.1
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        JSON implementation in C
 
 License:        MIT
@@ -149,7 +149,6 @@ end
 
 
 %files
-%doc %dir %{_pkgdocdir}
 %license AUTHORS
 %license COPYING
 %{_libdir}/lib%{name}.so.%{so_ver}*
@@ -175,6 +174,9 @@ end
 
 
 %changelog
+* Thu Nov 28 2019 Petr Menšík <pemensik@redhat.com> - 0.13.1-8
+- Remove empty doc dir from library package
+
 * Wed Nov 06 2019 Miroslav Lichvar <mlichvar@redhat.com> 0.13.1-7
 - Disable rdrand support (#1745333)