Log Message:
neverball: Needs c99 and avoid vsnprintf(3) hacks

- On NetBSD (and probably other operating system) the build failed
  because due `extern int vsnprintf(char *, size_t, const char *, va_list);'
  and SSP use.  `-std=c99' is already passed to the compiler
  and vsnprintf(3) is part of C99 so avoid the `extern'.
- Add LICENSE

Bump PKGREVISION

Problem noticed and original patch by chardar on #pkgsrc with little
adjustments from me, thanks a lot!