gcc-libraries should be updated and delivered via 6.9.z.
Scratch build went fine, dev_ack.
Can you please specify which architectures and variants should contain libgfortran4 pkg?
Testing results for gcc-libraries-7.2.1-1.2.1.el6 look good to me.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.