[PATCH] sandbox: fix linker error for SDL build

[alison at she-devel.com]

From: Alison Chaiken <alison at she-devel.com>

The patches fixes the following build failure:

$ make sandbox_defconfig

$ make nconfig

Turn on SANDBOX_SDL.

$ make u-boot

[ . . . ]

  LTO     u-boot
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o: in function
    `dm_test_video_bmp8':
/home/alison/gitsrc/u-boot/test/dm/video.c:415:(.text+0x16bb): undefined
    reference to `sandbox_sdl_set_bpp'
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o: in function
    `dm_test_video_bmp32':
/home/alison/gitsrc/u-boot/test/dm/video.c:507:(.text+0x189c): undefined
    reference to `sandbox_sdl_set_bpp'
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o: in function
    `dm_test_video_comp_bmp32':
/home/alison/gitsrc/u-boot/test/dm/video.c:543:(.text+0x1a7d): undefined
    reference to `sandbox_sdl_set_bpp'
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o: in function
    `dm_test_video_comp_bmp8':
/home/alison/gitsrc/u-boot/test/dm/video.c:563:(.text+0x1c5e): undefined
    reference to `sandbox_sdl_set_bpp'
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o: in function
    `dm_test_video_bmp16':
/home/alison/gitsrc/u-boot/test/dm/video.c:437:(.text+0x1e49): undefined
    reference to `sandbox_sdl_set_bpp'
/usr/bin/ld: /tmp/ccEZac9f.ltrans48.ltrans.o:
    /home/alison/gitsrc/u-boot/test/dm/video.c:461: more undefined
        references to `sandbox_sdl_set_bpp' follow
collect2: error: ld returned 1 exit status
make: *** [Makefile:2029: u-boot] Error 1

Signed-off-by: Alison Chaiken <alison at she-devel.com>
---
 arch/sandbox/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index d61a327f151..d8fedee55b1 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -55,6 +55,7 @@ config HOST_HAS_SDL
 config SANDBOX_SDL
 	bool "Enable SDL2 support in sandbox"
 	default HOST_HAS_SDL
+	select VIDEO_SANDBOX_SDL if VIDEO
 
 config SANDBOX_CRASH_RESET
 	bool "Reset on crash"
-- 
2.47.2