rpi-userland: needs threads

Fixes http://autobuild.buildroot.net/results/c3b4c09edee2499e811808018be1858bdee70436/

Signed-off-by: Phil Eichinger <phil@zankapfel.net>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rpi-userland/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_RPI_USERLAND
 	depends on BR2_arm
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_LARGEFILE
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_HAS_OPENGL_EGL
 	select BR2_PACKAGE_HAS_OPENGL_ES
 	select BR2_PACKAGE_HAS_OPENVG
@@ -16,5 +17,5 @@ config BR2_PACKAGE_RPI_USERLAND
 
 	  https://github.com/raspberrypi/userland/
 
-comment "rpi-userland requires a toolchain with C++ and LARGEFILE support"
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_LARGEFILE
+comment "rpi-userland requires a toolchain with C++, LARGEFILE and threads support"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS