Break the current build dependency on perl. Perl is required for

Break the current build dependency on perl.  Perl is required for
include/tdbsam2_parse_info.h which is included by sam/gumm_tdb.c which
doesn't seem to be used anywhere.

It would be nice to have the tdbsam2 stuff hidden behind a --with
configuration parameter so it doesn't interfere with normal builds.

(One of the build farm machines doesn't have perl installed).