gst-plugins-bad: depend on directfb instead of selecting it for directfb plugin

As discussed here:
http://lists.busybox.net/pipermail/buildroot/2015-September/139213.html

It makes more sense to use 'depends on' (and default to y) for a big
dependency like directfb.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer/gst-plugins-bad/Config.in

@@ -260,13 +260,8 @@ config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_CURL
 
 config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_DIRECTFB
 	bool "directfb"
-	select BR2_PACKAGE_DIRECTFB
-	depends on BR2_TOOLCHAIN_HAS_THREADS
-	depends on BR2_INSTALL_LIBSTDCPP
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_5 # directfb
-
-comment "directfb needs a toolchain w/ C++, threads, gcc >= 4.5"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
+	depends on BR2_PACKAGE_DIRECTFB
+	default y
 
 config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_DVB
 	bool "dvb"