[tlbuild] forgotten wrappers on woe32

[Vladimir Volovich]

Hi!

Master/bin/win32 contains:

1) mk4ht, mk4ht.exe

  these should be removed, and instead mk4ht.bat should be created as a
  copy of tl-w32-starter.bat

2) pdfatfi.exe

  should be removed, and instead pdfatfi.bat should be created as a
  copy of tl-w32-starter.bat

3) texi2html.exe

  should be removed, because texlive no longer contains texi2html

Best,
v.