tlbuild: Configure options for texk/dvipdfm-x

 
 7.2.5 Configure options for 'texk/dvipdfm-x'
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 The former modules 'dvipdfmx' (extended DVI to PDF converter) and
 'xdvipdfmx' (the same, as used by XeTeX) have been merged into
 'dvipdfm-x' at the source level.  Two separate binaries are still
 created by default.  In addition, 'dvipdfm' is created as a symlink to
 'dvipdfmx', with backward-compatible (very slightly different) behavior.
 
 '--disable-dvipdfmx'
 Do not build the 'dvipdfmx' program or make the 'dvipdfm' symlink.
 
 '--disable-xdvipdfmx'
 Do not build the 'xdvipdfmx' program.