gnu: poppler: Build the poppler-glib bindings.

* gnu/packages/pdf.scm (poppler): Add Cairo and GLib as inputs.

gnu: Use the 'patches' field of <origin>.

* gnu/packages/apr.scm,
  gnu/packages/autotools.scm,
  gnu/packages/avahi.scm,
  gnu/packages/cdrom.scm,
  gnu/packages/cmake.scm,
  gnu/packages/cpio.scm,
  gnu/packages/cross-base.scm,
  gnu/packages/emacs.scm,
  gnu/packages/flex.scm,
  gnu/packages/fontutils.scm,
  gnu/packages/glib.scm,
  gnu/packages/grub.scm,
  gnu/packages/guile.scm,
  gnu/packages/idutils.scm,
  gnu/packages/libevent.scm,
  gnu/packages/linux.scm,
  gnu/packages/mail.scm,
  gnu/packages/make-bootstrap.scm,
  gnu/packages/mp3.scm,
  gnu/packages/oggvorbis.scm,
  gnu/packages/pdf.scm,
  gnu/packages/plotutils.scm,
  gnu/packages/qemu.scm,
  gnu/packages/recutils.scm,
  gnu/packages/rush.scm,
  gnu/packages/scheme.scm,
  gnu/packages/system.scm,
  gnu/packages/tcsh.scm,
  gnu/packages/valgrind.scm,
  gnu/packages/vpn.scm,
  gnu/packages/w3m: Use the 'patches' field of <origin> instead of
  adding a patch as input plus using #:patches.

Merge branch 'core-updates'

gnu: xpdf: Use gs-fonts to provide standard postscript fonts.

* gnu/packages/pdf (xpdf): Add path to gs-fonts in xpdfrc.

Merge branch 'xorg' into core-updates

gnu: Add xpdf.

* gnu/packages/pdf.scm (xpdf): New variable.
* gnu/packages/patches/xpdf-constchar.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: add dependencies to poppler.

Add libpng and zlib to the inputs.

gnu: Rename module 'freetype' to the more general 'fontutils'.

* gnu/packages/freetype.scm: Rename file to...
* gnu/packages/fontutils.scm: ...this.
* Makefile.am (MODULES): Rename module.
* gnu/packages/{ghostscript,grub,pdf,texlive}.scm: Rename dependency.

gnu: Add poppler.

* gnu/packages/pdf.scm: New file.
* Makefile.am (MODULES): Add it.