Quiesce clang warning while building lpc.
usr.sbin/lpr/lpc/lpc.c
Warning passing 'char *[20]' to parameter of type 'const char **' discards qualifiers in nested pointer types [-Wincompatible-pointer-types-discards-qualifiers] Fix: Explicitly cast the variable "margv" to const char ** only for it's use as a parameter to suppress the error
Submitted by: Aaron Prieger <aprieger@llnw.com>
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D11019