webkit: depend on C++ + wchar support in toolkit, as icu needs it

package/webkit/Config.in

@@ -1,5 +1,7 @@
 config BR2_PACKAGE_WEBKIT
 	bool "webkit"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_WCHAR
 	select BR2_PACKAGE_LIBGTK2
 	select BR2_PACKAGE_ICU
 	select BR2_PACKAGE_CURL
@@ -11,3 +13,5 @@ config BR2_PACKAGE_WEBKIT
 
 		http://webkit.org/
 
+comment "webkit requires a toolchain with C++ support and WCHAR enabled"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR