sandbox: Adjust the order of the NO_SDL check

An option is provided to avoid using SDL in U-Boot sandbox (and drop
support for the LCD). However the check in the Makefile is too late
and warnings are printed even if NO_SDL=y is given.

Adjust the order to avoid this warning.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jeroen Hofstee <jeroen@myspectrum.nl>

arch/sandbox/config.mk

@@ -5,10 +5,16 @@ PLATFORM_CPPFLAGS += -D__SANDBOX__ -U_FORTIFY_SOURCE
 PLATFORM_CPPFLAGS += -DCONFIG_ARCH_MAP_SYSMEM -DCONFIG_SYS_GENERIC_BOARD
 PLATFORM_LIBS += -lrt
 
+# Define this to avoid linking with SDL, which requires SDL libraries
+# This can solve 'sdl-config: Command not found' errors
+ifneq ($(NO_SDL),)
+PLATFORM_CPPFLAGS += -DSANDBOX_NO_SDL
+else
 ifdef CONFIG_SANDBOX_SDL
 PLATFORM_LIBS += $(shell sdl-config --libs)
 PLATFORM_CPPFLAGS += $(shell sdl-config --cflags)
 endif
+endif
 
 # Support generic board on sandbox
 __HAVE_ARCH_GENERIC_BOARD := y
@@ -18,9 +24,3 @@ cmd_u-boot__ = $(CC) -o $@ -T u-boot.lds \
 	$(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map
 
 CONFIG_ARCH_DEVICE_TREE := sandbox
-
-# Define this to avoid linking with SDL, which requires SDL libraries
-# This can solve 'sdl-config: Command not found' errors
-ifneq ($(NO_SDL),)
-PLATFORM_CPPFLAGS += -DSANDBOX_NO_SDL
-endif