package/vulkan-loader: drop directfb support

As we're about to remove the DirectFB package, let's drop DirectFB
support in vulkan-loader.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/vulkan-loader/vulkan-loader.mk

@@ -15,15 +15,9 @@ VULKAN_LOADER_DEPENDENCIES = host-pkgconf vulkan-headers
 VULKAN_LOADER_CONF_OPTS += \
 	-DASSEMBLER_WORKS=FALSE \
 	-DBUILD_WSI_SCREEN_QNX_SUPPORT=OFF \
+	-DBUILD_WSI_DIRECTFB_SUPPORT=OFF \
 	-DLOADER_CODEGEN=OFF
 
-ifeq ($(BR2_PACKAGE_DIRECTFB),y)
-VULKAN_LOADER_DEPENDENCIES += directfb
-VULKAN_LOADER_CONF_OPTS += -DBUILD_WSI_DIRECTFB_SUPPORT=ON
-else
-VULKAN_LOADER_CONF_OPTS += -DBUILD_WSI_DIRECTFB_SUPPORT=OFF
-endif
-
 ifeq ($(BR2_PACKAGE_LIBXCB),y)
 VULKAN_LOADER_DEPENDENCIES += libxcb
 VULKAN_LOADER_CONF_OPTS += -DBUILD_WSI_XCB_SUPPORT=ON