fix compile warning originating in cpp skeleton

[GitMensch]

gcount() is of type streamsize which has a system-dependent size with at least int. Because of the int max_size limit no bigger value will be returned, the explicit cast fixes warnings from compilers/static analyzers.

As an alternative LexerInput may be changed to have a return and parameter of type streamsize, but this would need more changes and likely create more warnings in other places.

This issue originates from lexxmark/winflexbison#73 where more details can be found (this is not a MSVC only issue).

[Mightyjo]

Looks good. Your reasoning makes sense. I double-check that streamsize is defined as a "signed, integral type", so with our limit to int max_size this seems right.

'git clean -xf' ... 'make distcheck' from a clean maintainer tree build cleanly.

[GitMensch]

@Mightyjo Thanks for the review, so it is up to @westes to merge.

Side question @westes: maybe there's someone that could be added as a developer to this repo and could work on handling the PRs (currently 39 open) / issues (>100)?