Just Need runtime tests

* libsane dependency on libusb moved to those drivers that requires it
* clean up some ./configure args
* added saned-ricoh2 for new backend
* enabled saned-gphoto2 (after c8fbe26c53)
* disabled kvs40xx and mustek_usb2 that requires pthread while the issue is
not solved (https://gitlab.com/sane-project/backends/issues/153)
* patches refreshed:
 - 002-remove-uneeded.patch
* patches dropped:
 - 031-fix_uclibc.patch
 - 050-remove_linked_libs_for_unused_preload.patch (with --disable-preload)

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

Fixes CVE-2017-6318

Patches where refreshed and the following removed:
- 020-fix_pieusb.patch: fixed upstream
- 030-musl.patch: accepted upstream

PS: there was no sane-backends 1.0.26

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

Changes since oldpackages:
- updated to 1.0.25
  * most of openwrt patches are upstreamed now
- cups dependency was completely removed
- small musl patch
- small uclibc patch
- removed link to extra libraries in libsane (used only
  for preload backends)
- sane-libs and sane-backends merged and exploded into
  individual packages for each backend:
  * libsane for sane library (which backends should dep on)
  * sane-daemon for saned daemon
  * sane-xxx for sane backend for xxx
  ** each backend has its own custom dep libraries
  * sane-backends-all (with no files) that deps on all backends
  * sane-qcam is only available for x86/x86_64
  ** other archs does not implement inb/outb (at least in musl)

Now it is possible to use SANE with much less FS space (KB
instead of MB).

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

Changes since oldpackages:
- cups dependency was completely removed
  * This also happened in sane trunk version
- small musl patch
- added detection of inb,outb (link error with musl)
  * this also removes hack 020-non-i386-qcam.patch
- fix for segfault when using sane-test backend
- removed link to extra libraries in libsane (used only
  for preload backends)
- added format-security fix
- sane-libs and sane-backends merged and exploded into
  individual packages for each backend:
  * libsane for sane library (which backends should dep on)
  * sane-daemon for saned daemon
  * sane-xxx for sane backend for xxx
  ** each backend has its own custom dep libraries
  * sane-backends-all (with no files) that deps on all backends
  * sane-qcam is only available for x86/x86_64
  ** other archs does not implement inb/outb (at least in musl)

Now it is possible to use SANE with much less FS space (KB
instead of MB).

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>