sane-backends: update to 1.0.28 (WIP)

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>

utils/sane-backends/files/saned.xinetd

@@ -0,0 +1,15 @@
+# default: off
+# description: The saned provides scanner service via the network.  \
+#	Applications like kooka, xsane or xscanimage can use the remote \
+#	scanner. 
+service sane-port
+{
+	socket_type = stream
+	port        = 6566
+	wait        = no
+	user        = root
+#	user        = saned
+	group       = scanner
+	server      = /usr/sbin/saned
+	disable     = yes
+}