package/sdl2: remove sdl2-config.cmake

We are using autotools build system for sdl2, so the sdl2-config.cmake
include path are not resolved like for sdl2-config script [1].
Remove sdl2-config.cmake file and avoid unsafe include path if this
file is used by a cmake based package.

This trigger an issue with ogre 1.12.6 package that replaced
FindSDL2.cmake by sdl2-config.cmake [2].

Thanks to Pavel Rojtberg for the help [3].

[1] https://bugzilla.libsdl.org/show_bug.cgi?id=4597
[2] OGRECave/ogre@6de6f9b
[3] OGRECave/ogre#1568

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/sdl2/sdl2.mk

@@ -20,6 +20,16 @@ SDL2_CONF_OPTS += \
 	--disable-pulseaudio \
 	--disable-video-wayland
 
+# We are using autotools build system for sdl2, so the sdl2-config.cmake
+# include path are not resolved like for sdl2-config script.
+# Remove sdl2-config.cmake file and avoid unsafe include path if this
+# file is used by a cmake based package.
+# https://bugzilla.libsdl.org/show_bug.cgi?id=4597
+define SDL2_REMOVE_SDL2_CONFIG_CMAKE
+	rm -rf $(STAGING_DIR)/usr/lib/cmake/SDL2
+endef
+SDL2_POST_INSTALL_STAGING_HOOKS += SDL2_REMOVE_SDL2_CONFIG_CMAKE
+
 # We must enable static build to get compilation successful.
 SDL2_CONF_OPTS += --enable-static