[dvipdfmx] "mktexpk" is not disabled for fonts loaded by relative path

[Igor Liferenko]

Hi Akira,

> Call as
> MKTEXPK=0 dvipdfmx filename
> to disable automatic mktexpk.
> Call as
> MKTEXPK=1 dvipdfmx filename
> to enable automatic mktexpk.

This works for all fonts at once.
This does not allow to inhibit mktexpk only for selected fonts.

Best,
Igor