libvpx: needs thread support

Fixes:

  http://autobuild.buildroot.org/results/8de/8def7e54e4fecb7df350443824c00b53d1c61c01/build-end.log

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Samuel Martin <s.martin49@gmail.com>

package/gstreamer1/gst1-plugins-good/Config.in

@@ -335,9 +335,13 @@ comment "taglib needs a toolchain w/ C++"
 config BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_VPX
 	bool "vpx (webm)"
 	select BR2_PACKAGE_LIBVPX
+	depends on BR2_TOOLCHAIN_HAS_THREADS # libvpx
 	help
 	  VP8 plugin
 
+comment "libvpx needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS
+
 config BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_WAVPACK
 	bool "wavpack (*.wv audio)"
 	select BR2_PACKAGE_WAVPACK

package/libvpx/Config.in

@@ -1,7 +1,11 @@
 config BR2_PACKAGE_LIBVPX
 	bool "libvpx"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	help
 	  A high-quality, open video format that's freely available to
 	  everyone.
 
 	  http://webmproject.org
+
+comment "libvpx needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS