gnu: Make libtool and libltdl completely separate.

gnu: Make libtool and libltdl completely separate.

* gnu/packages/autotools.scm (libtool)[outputs]: Remove.
  [arguments]: Remove 'if' around arguments.  Add #:configure-flags.
* gnu/packages/apr.scm (apr)[inputs]: Change libtool to libltdl.
* gnu/packages/fontutils.scm (libuninameslist)[native-inputs]: Remove
  "libtool-bin".
* gnu/packages/global.scm (global): Change libtool to libltdl.
* gnu/packages/gnunet.scm (libextractor, gnunet): Likewise.
* gnu/packages/graphviz.scm (graphviz): Likewise.
* gnu/packages/libcanberra.scm (libcanberra): Likewise.
* gnu/packages/libevent.scm (libuv)[native-inputs]: Remove "bin" part
  for libtool.
* gnu/packages/mail.scm (mailutils): Change libtool to libltdl.
  (libetpan): Remove "bin" part for libtool.
* gnu/packages/mp3.scm (libmp3splt): Change libtool to libltdl.
* gnu/packages/openldap.scm (openldap): Remove "bin" part of libtool.
  Move it from 'inputs' to 'native-inputs'.
* gnu/packages/photo.scm (libgphoto2): Change libtool to libltdl.
* gnu/packages/pulseaudio.scm (pulseaudio): Likewise.
* gnu/packages/ssh.scm (guile-ssh): Remove "bin" part of libtool.
* gnu/packages/web.scm (libpsl): Likewise.
* gnu/packages/weechat.scm (weechat): Move libtool to 'native-inputs'
  and add libltdl to 'inputs'.