SPEC file in version 1.13.1 references version 1.4; unable to build RPM from source

[commandline-johnny]

Describe the bug
rpmbuild -ta ./unbound-1.13.1.tar.gz fails because SPEC file references version 1.4 instead of 1.13.1. Updating SPEC file with version results in further errors.

To reproduce
Steps to reproduce the behavior:

1. Download unbound-1.13.1.tar.gz from nlnetlabs website
2. Run `rpmbuild -ta unbound-1.13.1.tar.gz

Expected behavior
rpmbuild should build binary RPM from source

System:

• Unbound version: 1.13.1
• OS: CentOS 7

[wcawijngaards]

The spec files that are actually used by distros are maintained by themselves, these files are examples that have been contributed. There is contrib/unbound.spec and contrib/unbound.spec_fedora.

These are the fixes to the unbound.spec file so that it works with 1.13.1. It fixes the errors that rpmbuild reports.

- ldns and ldns-devel no longer required. Fixed date. Version to 1.13.1.
- Removed symlink %attr mode, made unbound.conf symlink relative.
- Added pkgconfig/libunbound.pc to the packaged files.