[dvipdfmx] ghostscript 9.50 and xetex

[Akira Kakuto]

Hi Herbert,

> with latest GhostScript 9.50 PSTricks doesn't work anymore:

Fixed here.  I'll commit changes in spc_dvips.c in TeX Live svn soon.
As Andreas pointed out, -dDELAYSAFER in dvipdfmx.cfg is also necessary.

Thanks,
Akira