Drop policyhelp utility
    
    https://fedoraproject.org/wiki/SELinux_Policy_Modules_Packaging_Draft#Build_Dependencies
    
    The /usr/share/selinux/devel/policyhelp requirement was necessary to
    extract the version number of the selinux-policy package being built
    against, which is used to enforce a minimum version requirement on
    selinux-policy when the built package is installed. The policyhelp file
    itself can be found in either the selinux-policy, selinux-policy-devel,
    or selinux-policy-doc package (depending on OS release), which is why we
    cannot simply use a package name unless we are prepared to sacrifice
    spec file portability. From Fedora 20 onwards, this method is no longer
    necessary, so if your packaging is not targeting any releases prior to
    Fedora 20 or EPEL-5/6, the /usr/share/selinux/devel/policyhelp
    requirement is not needed.
    
    Resolves: rhbz#1498429