package/sdl2: use BR2_PACKAGE_MESA3D_GBM

BR2_PACKAGE_MESA3D_GBM should be used instead of
BR2_PACKAGE_MESA3D_OPENGL_EGL as spotted by Arnout in review of
https://patchwork.ozlabs.org/project/buildroot/patch/20210821093908.677218-1-fontaine.fabrice@gmail.com/

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/sdl2/Config.in

@@ -32,14 +32,13 @@ comment "X11 video driver needs X.org"
 config BR2_PACKAGE_SDL2_KMSDRM
 	bool "KMS/DRM video driver"
 	depends on BR2_PACKAGE_LIBDRM
-	# requires libgbm from mesa3d
-	depends on BR2_PACKAGE_MESA3D_OPENGL_EGL
+	depends on BR2_PACKAGE_MESA3D_GBM
 
 comment "KMS/DRM video driver needs libdrm"
 	depends on !BR2_PACKAGE_LIBDRM
 
-comment "KMS/DRM video driver needs an OpenGL EGL backend provided by mesa3d"
-	depends on !BR2_PACKAGE_MESA3D_OPENGL_EGL
+comment "KMS/DRM video driver needs mesa3d w/ GBM"
+	depends on !BR2_PACKAGE_MESA3D_GBM
 
 config BR2_PACKAGE_SDL2_OPENGL
 	bool "OpenGL (GLX)"