[Buildroot] [git commit branch/2017.02.x] sdl2: explicitly disable raspberry pi video backend

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=2bcace3da781cad01ee8fca04d871e312108f916
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2017.02.x

Fixes:
http://autobuild.buildroot.net/results/d59/d5992dcc9a49ee77afaebdcc9448ac1868fa7de1/
http://autobuild.buildroot.net/results/e89/e894f21ce1983ee3bd8d65a8e59e1adab9a62707/

The configure script automatically enables support for the raspberry pi
video backend if it detects the rpi-userland package.  Unfortunately it
hardcodes a number of include/linker paths unsuitable for cross compilation,
breaking the build:

    if test x$enable_video = xyes -a x$enable_video_rpi = xyes; then
..
     RPI_CFLAGS="-I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux"
     RPI_LDFLAGS="-L/opt/vc/lib -lbcm_host"
    fi

So explicitly disable it until the configure script is fixed.

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
(cherry picked from commit 3a798acf239dee04d573f575337bf823c13020fd)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/sdl2/sdl2.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/sdl2/sdl2.mk b/package/sdl2/sdl2.mk
index 7710a40..d15b198 100644
--- a/package/sdl2/sdl2.mk
+++ b/package/sdl2/sdl2.mk
@@ -20,7 +20,8 @@ SDL2_CONF_OPTS += \
 	--disable-pulseaudio \
 	--disable-video-opengl \
 	--disable-video-opengles \
-	--disable-video-wayland
+	--disable-video-wayland \
+	--disable-video-rpi
 
 # We must enable static build to get compilation successful.
 SDL2_CONF_OPTS += --enable-static