qt5base: use 'depends on' for directfb

This is the only package where we select directfb. Change it to use depends
on to match what we do for the X11 backend.

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

package/qt5/qt5base/Config.in

@@ -178,11 +178,10 @@ config BR2_PACKAGE_QT5BASE_LINUXFB
 
 config BR2_PACKAGE_QT5BASE_DIRECTFB
 	bool "directfb support"
-	select BR2_PACKAGE_DIRECTFB
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_5 # directfb
+	depends on BR2_PACKAGE_DIRECTFB
 
-comment "directfb needs a toolchain w/ gcc >= 4.5"
-	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
+comment "directfb backend if directb is enabled"
+	depends on !BR2_PACKAGE_DIRECTFB
 
 config BR2_PACKAGE_QT5BASE_XCB
 	bool "X.org XCB support"