Disable K&R style function definitions for WARNS=6.

Unfortunately there are two slight problems with that:

- Yacc and lex might generate code that generates warnings because of
  this. Require yacc and lex to be rebuilt during bootstrap. I'm not
  incrementing __FreeBSD_version here, because I assume someone else
  will do this eventually.

- When running `make buildkernel', it uses share/mk from the source
  treeo to build aicasm. Because aicasm also depends on lex, this would
  break. Lower WARNS to 5 for now. We should just increment it to 6
  again somewhere in the very far future.

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