gnu: slim: Upgrade to 1.3.6; allow the choice of a config file at run time.
* gnu/packages/slim.scm (slim): Upgrade to 1.3.6. Add patches. Comment
out systemd-related stuff from CMakeLists.txt. Add
"-DBUILD_SHARED_LIBS=OFF" and "-DCMAKE_SKIP_BUILD_RPATH=ON" to
#:configure-flags. Adjust 'home-page' field.
* gnu/packages/patches/slim-config.patch,
gnu/packages/patches/slim-session.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
gnu: Move numerous "inputs" which should be "native-inputs".
* gnu/packages/avahi.scm, gnu/packages/cdrom.scm, gnu/packages/cryptsetup.scm,
gnu/packages/curl.scm, gnu/packages/emacs.scm, gnu/packages/fontutils.scm,
gnu/packages/gdb.scm, gnu/packages/geeqie.scm, gnu/packages/ghostscript.scm,
gnu/packages/glib.scm, gnu/packages/gnome.scm, gnu/packages/gnunet.scm,
gnu/packages/gnupg.scm, gnu/packages/gnuzilla.scm, gnu/packages/graphviz.scm,
gnu/packages/groff.scm, gnu/packages/gstreamer.scm, gnu/packages/gtk.scm,
gnu/packages/gv.scm, gnu/packages/imagemagick.scm, gnu/packages/irssi.scm,
gnu/packages/kde.scm, gnu/packages/libcanberra.scm, gnu/packages/libtiff.scm,
gnu/packages/linux.scm, gnu/packages/lvm.scm, gnu/packages/mp3.scm,
gnu/packages/netpbm.scm, gnu/packages/parted.scm, gnu/packages/pdf.scm,
gnu/packages/pulseaudio.scm, gnu/packages/qemu.scm, gnu/packages/qt.scm,
gnu/packages/ratpoison.scm, gnu/packages/rdf.scm, gnu/packages/slim.scm,
gnu/packages/texlive.scm, gnu/packages/version-control.scm,
gnu/packages/video.scm, gnu/packages/vpn.scm, gnu/packages/w3m.scm,
gnu/packages/xml.scm, gnu/packages/xnee.scm, gnu/packages/xorg.scm,
gnu/packages/zip.scm: Move some build-time dependencies from `inputs' to
`native-inputs'.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>