[tlbuild] pdftexDownloadBase14 false

[Bob Tennent]

This in my personal updmap.cfg seems to confuse updmap-user.
The result of running dvipdfmx is

  dvipdfmx:warning: Invalid char in fontmap line: 2
  dvipdfmx:warning: Invalid map record in fontmap line 8 from pdftex.map.
  dvipdfmx:warning: -- Ignore the current input buffer: cob Courier-Bold 262179 " TeXnANSIEncoding ReEncodeFont " <texnansi.enc

On some inputs dvipdfmx tries to use mktexpk instead of
available type1 fonts.

Changing to pdftexDownloadBase14 true avoids all this.

Bob T.