Log Message:
Update to chicken-3.0.0, from pkgsrc-wip.

Some highlights:
3.0.0:
- On sparc64 architectures more than 126 procedure arguments are allowed
  [Thanks to Peter Bex]
2.7xx:
- PCRE support
- new GNU Make based build process
- libffi is not used anymore, handcoded assembler is used for x86, x86-64
  and powerpc platforms
- TCP timeout handling
- added Lisp-style symbol property lists
- the "chicken-bug" program can now be used to create bug reports
- countless bugfixes and minor improvements