weston: add missing toolchain comments

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[yann.morin.1998@free.fr: fix missing double-quote at end of comment]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/weston/Config.in

@@ -1,5 +1,5 @@
-comment "weston requires udev"
-	depends on !BR2_PACKAGE_UDEV
+comment "weston needs udev and a toolchain w/ threads"
+	depends on !BR2_PACKAGE_UDEV || !BR2_TOOLCHAIN_HAS_THREADS
 
 config BR2_PACKAGE_WESTON
 	bool "weston"
@@ -33,6 +33,10 @@ config BR2_PACKAGE_WESTON_HAS_COMPOSITOR
 config BR2_PACKAGE_WESTON_FBDEV
 	bool "fbdev compositor"
 
+comment "RPi compositor needs a toolchain w/ C++, largefile, threads"
+	depends on BR2_arm
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS
+
 config BR2_PACKAGE_WESTON_RPI
 	bool "RPi compositor"
 	depends on BR2_arm                      # rpi-userland