For POLA reasons, disable SGR sequences in catpages.
For POLA reasons, disable SGR sequences in catpages.

See r222647 for a similar change to bsd.doc.mk after SGR was generally
turned on in groff.

Suggested by:	ru
Approved by:	re (kib)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase