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>

sane-xxx backend packages are hidden packages with custom
config and CONFIG_ALL does not select them alone. Now
sane-backends depends on +ALL:sane-backends-all.

No existing ipk is affected as the changed package/sane-backends
does not exist as an ipk.

030-musl.patch was updated to be submitted upstream. However,
the added preprocessor #if are always true for OpenWRT and will
not change the resulting code.

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>