[REVIEW 3-5] fix RTF import of PNG images with bogus width/height

[Miklos Vajna]

Hi,

See
http://cgit.freedesktop.org/libreoffice/core/commit/?id=66fa759bb6d8199404b482512d7609ba47265ae8

It fixes a regression from the old filter, which ignored PNG image
width/height values.

Could somebody sign-off and push to -3-5, please?

Thanks,

Miklos