build: Use rpm defined _sbindir for installed binaries.

All binaries from applications used by root only should go to _sbindir
that is defined as rpm macro. /sbin is to be used for system level
utilities only.

rpm/policycoreutils.spec

@@ -36,9 +36,6 @@
 %define python3_sitelib /%{_libdir}/python3.?/site-packages
 %endif
 
-# tools expect several binaries to reside in /sbin. putting them there is easier until we symlink the whole /usr/sbin to /sbin
-%define _sbindir /sbin
-
 Summary: SELinux policy core utilities
 Name:    policycoreutils
 Version: 2.8