package/qt5/qt5base: drop directfb graphics backend

As we're about to remove the DirectFB package, let's drop the DirectFB
graphics backend in Qt5.

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

Config.in.legacy

@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2025.02"
 
+config BR2_PACKAGE_QT5BASE_DIRECTFB
+	bool "qt5base directfb support removed"
+	select BR2_LEGACY
+	help
+	  The directfb support from qt5base is no longer available, as
+	  directfb is no longer packaged in Buildroot.
+
 config BR2_PACKAGE_GST1_PLUGINS_BAD_PLUGIN_DIRECTFB
 	bool "gstreamer directfb plugin removed"
 	select BR2_LEGACY

package/qt5/qt5base/Config.in

@@ -128,7 +128,6 @@ config BR2_PACKAGE_QT5BASE_GUI
 	# At least one graphic backend must be enabled, so enable
 	# linuxfb if nothing is enabled.
 	select BR2_PACKAGE_QT5BASE_LINUXFB if \
-	       !BR2_PACKAGE_QT5BASE_DIRECTFB && \
 	       !BR2_PACKAGE_QT5BASE_XCB && \
 	       !BR2_PACKAGE_QT5BASE_EGLFS
 	help
@@ -195,13 +194,6 @@ config BR2_PACKAGE_QT5BASE_VULKAN
 config BR2_PACKAGE_QT5BASE_LINUXFB
 	bool "linuxfb support"
 
-config BR2_PACKAGE_QT5BASE_DIRECTFB
-	bool "directfb support"
-	depends on BR2_PACKAGE_DIRECTFB
-
-comment "directfb backend available if directfb is enabled"
-	depends on !BR2_PACKAGE_DIRECTFB
-
 config BR2_PACKAGE_QT5BASE_XCB
 	bool "X.org XCB support"
 	depends on BR2_PACKAGE_XORG7

package/qt5/qt5base/qt5base.mk

@@ -40,7 +40,8 @@ QT5BASE_CONFIGURE_OPTS += \
 	-system-pcre \
 	-no-pch \
 	-shared \
-	-no-feature-relocatable
+	-no-feature-relocatable \
+	-no-directfb
 
 # starting from version 5.9.0, -optimize-debug is enabled by default
 # for debug builds and it overrides -O* with -Og which is not what we
@@ -173,8 +174,6 @@ QT5BASE_CONFIGURE_OPTS += $(if $(BR2_PACKAGE_QT5BASE_WIDGETS),-widgets,-no-widge
 # We have to use --enable-linuxfb, otherwise Qt thinks that -linuxfb
 # is to add a link against the "inuxfb" library.
 QT5BASE_CONFIGURE_OPTS += $(if $(BR2_PACKAGE_QT5BASE_LINUXFB),--enable-linuxfb,-no-linuxfb)
-QT5BASE_CONFIGURE_OPTS += $(if $(BR2_PACKAGE_QT5BASE_DIRECTFB),-directfb,-no-directfb)
-QT5BASE_DEPENDENCIES   += $(if $(BR2_PACKAGE_QT5BASE_DIRECTFB),directfb)
 
 ifeq ($(BR2_PACKAGE_LIBXKBCOMMON),y)
 QT5BASE_CONFIGURE_OPTS += -xkbcommon