pmccabe2html: Depends on gawk.

[Mats Erik Andersson]

Hello there,

it turns out that the module pmccabe2html is strongly
dependent on gawk, since it expects

   systime() (once)

and

   strftime()  (twice)

to be available as built-in functions.

Since I would like to build distributions of libshishi
with only mawk, that dependency is a show stopper.
Could we please see the demands relaxed somewhat?

Best regards,
  Mats Erik Andersson, on behalf of Shishi