sane-backends: import from oldpackages

sane-backends: import from oldpackages

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>