redhat: add new dist-* targets for configs

Since the rename of all targets to dist-* targets, the specific config
target for RHEL configs do not work when called outside of the redhat directory:
the makefile filters only dist-% and distg-% targets, so it doesn't run against
redhat/Makefile and thus calling those targets do not work, unless you cd into the redhat directory.

Add new dist-* targets for configs and keep old ones for compatibility.