package/ola: add missing dependencies to libusb

Fixes:
- http://autobuild.buildroot.net/results/97d07f84cf8e34a697bd332c360ce353b96b2e26/

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/ola/ola.mk

@@ -203,6 +203,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_OLA_PLUGIN_STAGEPROFI),y)
 OLA_CONF_OPTS += --enable-stageprofi --enable-libusb
+OLA_DEPENDENCIES += libusb
 else
 OLA_CONF_OPTS += --disable-stageprofi
 endif
@@ -215,12 +216,14 @@ endif
 
 ifeq ($(BR2_PACKAGE_OLA_PLUGIN_USBDMX),y)
 OLA_CONF_OPTS += --enable-usbdmx --enable-libusb
+OLA_DEPENDENCIES += libusb
 else
 OLA_CONF_OPTS += --disable-usbdmx
 endif
 
 ifeq ($(BR2_PACKAGE_OLA_PLUGIN_USBPRO),y)
 OLA_CONF_OPTS += --enable-usbpro --enable-libusb
+OLA_DEPENDENCIES += libusb
 else
 OLA_CONF_OPTS += --disable-usbpro
 endif