[pdftex] pdftex core dump when including certain pdf files

[Akira Kakuto]

Dear Thanh,

>         fd = epdf_create_fontdescriptor(fontmap, round(stemV->getNum()));

I have checked in changed pdftoepdf.cc (r41713) by using
zround(stemV->getNum()) since it seems simpler to use the
original function in web2c/lib than including cpascal.h.

Best,
Akira