Bug 9137

I applied some changes from Krzysztof Kowalczyk and when I tried to compile
using the resulting files, I got errors in regard to the config file:

   poppler/poppler-config.h

The fact is, you treat it as a AM_CONFIG_HEADER() in your configure.ac which
means you have no file under poppler/*, since the autoreconf tool is expected to
generate the config file. But well... it won't work since you can have only one
AM_CONFIG_HEADER() [as far as I know].

Anyway, I moved the poppler/config.h from the AM_CONFIG_HEADER() to the
AC_OUTPUT() and at least that much works a lot better!

Also, I deleted the poppler-config.h since it is generated. I understand that
you may want to have it somewhere for VC users (but who uses VC anyway?! you
cannot write a script in VC!) I would suggest, if you want to do that, to place
that file in some win32 sub-folder either under poppler in under $(topdir).

Later, I will post my own patch so you can see all my changes.