Fix build on FreeBSD/amd64 9.1-RELEASE.

* FreeBSD 9.1's dtrace support has -h flag but "dtrace -h -s ../perldtrace.d"
  filed with following syntax error.
  "/usr/lib/dtrace/psinfo.d", line 37: syntax error near "uid_t"
  Adding dtrace support for perl5 on FreeBSD is hasty, I feel.
  dtrace support for FreeBSD perl5 is disabled.
Revert unintentional change to Makefile.
Regenerate distinfo with emul-distfile target.

* i386 distinfo is lost in previous update. It is fixed.