sbcsgen.pl uses 'select' to point Perl at a different default output
handle. Revert that when we hackily call it from mkfiles.pl, so that
if I have a need to insert diagnostics in the latter they won't go
into the end of sbcsdat.c.


git-svn-id: svn://svn.tartarus.org/sgt/putty@10013 cda61777-01e9-0310-a592-d414129be87e