Use #:prefix instead of #:renamer with 'symbol-prefix-proc'.

Use #:prefix instead of #:renamer with 'symbol-prefix-proc'.

* gnu/packages/abiword.scm, gnu/packages/admin.scm, gnu/packages/aidc.scm,
  gnu/packages/backup.scm, gnu/packages/bittorrent.scm,
  gnu/packages/boost.scm, gnu/packages/compression.scm,
  gnu/packages/cryptsetup.scm, gnu/packages/curl.scm,
  gnu/packages/cyrus-sasl.scm, gnu/packages/dc.scm, gnu/packages/emacs.scm,
  gnu/packages/fonts.scm, gnu/packages/fontutils.scm, gnu/packages/geeqie.scm,
  gnu/packages/ghostscript.scm, gnu/packages/gimp.scm,
  gnu/packages/gkrellm.scm, gnu/packages/gl.scm, gnu/packages/glib.scm,
  gnu/packages/gnome.scm, gnu/packages/gnunet.scm, gnu/packages/gnupg.scm,
  gnu/packages/gnutls.scm, gnu/packages/gnuzilla.scm, gnu/packages/gsasl.scm,
  gnu/packages/gtk.scm, gnu/packages/gv.scm, gnu/packages/image.scm,
  gnu/packages/indent.scm, gnu/packages/inkscape.scm,
  gnu/packages/lesstif.scm, gnu/packages/links.scm, gnu/packages/lisp.scm,
  gnu/packages/lsh.scm, gnu/packages/lsof.scm, gnu/packages/maths.scm,
  gnu/packages/mp3.scm, gnu/packages/openssl.scm, gnu/packages/ots.scm,
  gnu/packages/pciutils.scm, gnu/packages/pcre.scm, gnu/packages/pdf.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm, gnu/packages/slim.scm,
  gnu/packages/ssh.scm, gnu/packages/texlive.scm, gnu/packages/vim.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wv.scm,
  gnu/packages/xiph.scm, gnu/packages/xml.scm, gnu/packages/xorg.scm,
  gnu/packages/yasm.scm, gnu/packages/zip.scm,
  guix/build/cmake-build-system.scm, guix/build/perl-build-system.scm,
  guix/build/python-build-system.scm, guix/download.scm: Replaces uses of
  #:renamer and 'symbol-prefix-proc' with #:prefix.