Ensure compatibility with Bison for `--locations` option

[ydah]

❯ bison -h
Usage: bison [OPTION]... FILE
Generate a deterministic LR or generalized LR (GLR) parser employing
: (snip)
Tuning the Parser:
  -L, --language=LANGUAGE          specify the output programming language
  -S, --skeleton=FILE              specify the skeleton to use
  -t, --debug                      instrument the parser for tracing
                                   same as '-Dparse.trace'
      --locations                  enable location support
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^