sane_backends: Add patch for libusb context disabling

media-gfx/sane_backends/patches/sane_disable_libusb_context.patchset

@@ -0,0 +1,50 @@
+From ed4c9a8b17ced9f1668084539509d7866438fdc4 Mon Sep 17 00:00:00 2001
+From: Gerasim Troeglazov <3dEyes@gmail.com>
+Date: Mon, 16 Nov 2015 11:13:48 +0000
+Subject: Disable libusb context for Haiku
+
+
+diff --git a/sanei/sanei_usb.c b/sanei/sanei_usb.c
+index 9c07d22..e4f8b1d 100644
+--- a/sanei/sanei_usb.c
++++ b/sanei/sanei_usb.c
+@@ -498,7 +498,12 @@ sanei_usb_init (void)
+   if (!sanei_usb_ctx)
+     {
+       DBG (4, "%s: initializing libusb-1.0\n", __func__);
++#ifdef __HAIKU__
++      ret = libusb_init (NULL);
++      sanei_usb_ctx = -1;
++#else
+       ret = libusb_init (&sanei_usb_ctx);
++#endif      
+       if (ret < 0)
+ 	{
+ 	  DBG (1,
+@@ -556,7 +561,11 @@ int i;
+ #ifdef HAVE_LIBUSB_1_0
+       if (sanei_usb_ctx)
+         {
++#ifdef __HAIKU__
++          libusb_exit (NULL);
++#else
+           libusb_exit (sanei_usb_ctx);
++#endif          
+ 	  /* reset libusb-1.0 context */
+ 	  sanei_usb_ctx=NULL;
+         }
+@@ -880,7 +889,11 @@ static void libusb_scan_devices(void)
+ 
+   DBG (4, "%s: Looking for libusb-1.0 devices\n", __func__);
+ 
++#ifdef __HAIKU__
++  ndev = libusb_get_device_list (NULL, &devlist);
++#else
+   ndev = libusb_get_device_list (sanei_usb_ctx, &devlist);
++#endif  
+   if (ndev < 0)
+     {
+       DBG (1,
+-- 
+2.2.2
+