webkit: add comment mmu depends

Otherwise it shows up indirectly when toolchain options aren't enough
and then vanishes when they are fulfilled.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/webkit/Config.in

@@ -45,3 +45,4 @@ comment "webkit needs libgtk2 and a toolchain w/ C++, wchar, threads"
 	depends on BR2_PACKAGE_WEBKIT_ARCH_SUPPORTS
 	depends on !BR2_PACKAGE_LIBGTK2 || !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU