package/directfb: Disable dynload when BR2_PREFER_STATIC_LIB is enabled

fixes http://autobuild.buildroot.net/results/a74/a74b97053d7cad4fcce59f658a4b7b4340284b80/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/directfb/directfb.mk

@@ -26,6 +26,11 @@ DIRECTFB_CONF_OPT = \
 	--disable-video4linux \
 	--disable-video4linux2 \
 	--without-tools
+
+ifeq ($(BR2_PREFER_STATIC_LIB),y)
+DIRECTFB_CONF_OPT += --disable-dynload
+endif
+
 DIRECTFB_CONFIG_SCRIPTS = directfb-config
 
 DIRECTFB_DEPENDENCIES = freetype zlib