Support for the CVC language was removed in #7219 but the help message
for languages was not updated. This removes the mention of CVC from the
help message.
"\
Languages currently supported as arguments to the -L / --lang option:\n\
auto attempt to automatically determine language\n\
- cvc | presentation | pl CVC presentation language\n\
smt | smtlib | smt2 |\n\
smt2.6 | smtlib2.6 SMT-LIB format 2.6 with support for the strings standard\n\
tptp TPTP format (cnf, fof and tff)\n\
\n\
Languages currently supported as arguments to the --output-lang option:\n\
auto match output language to input language\n\
- cvc | presentation | pl CVC presentation language\n\
smt | smtlib | smt2 |\n\
smt2.6 | smtlib2.6 SMT-LIB format 2.6 with support for the strings standard\n\
tptp TPTP format\n\