[pdftex] Multiple references to image fails.

[Akira Kakuto]

FYI:
> Again, with latin modern, the "Hello, World." example shows no
> difference between plain-TeX and LaTeX:

... ...

> pdftex:   23946 bytes
> pdflatex: 23946 bytes

tex (or latex) + dvipdfmx -V 5 test: 2211 bytes

Best regards,
Akira