usb_modeswitch_data: requires thread support

usb_modeswitch_data unconditionally selects usb_modeswitch, but
usb_modeswitch depends on thread support. This commit has the thread
support dependency to usb_modeswitch_data.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/usb_modeswitch_data/Config.in

@@ -1,9 +1,13 @@
 config BR2_PACKAGE_USB_MODESWITCH_DATA
 	bool "usb_modeswitch_data"
 	select BR2_PACKAGE_USB_MODESWITCH
+	depends on BR2_TOOLCHAIN_HAS_THREADS # usb_modeswitch -> libusb
 	help
 	  USB mode switch data
 	  Contains udev rules and events to allow usb_modeswitch to
 	  function automatically
 
 	  http://www.draisberghof.de/usb_modeswitch/
+
+comment "usb_modeswitch_data needs a toolchain with thread support"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS