openrisc: pass endianness info to sparse

openrisc is big-endian only but sparse assumes the same endianness
as the building machine.
This is problematic for code which expect __BYTE_ORDER__ being
correctly predefined by the compiler which sparse can then
pre-process differently from what gcc would, depending on the
building machine endianness.

Fix this by letting sparse know about the architecture endianness.

To: Jonas Bonn <[e-mail]>
To: Stefan Kristiansson <[e-mail]>
To: Stafford Horne <[e-mail]>
Signed-off-by: Luc Van Oostenryck <[e-mail]>
Signed-off-by: Stafford Horne <[e-mail]>

arch/openrisc/Makefile

···
 LIBGCC 		:= $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
 
 KBUILD_CFLAGS	+= -pipe -ffixed-r10 -D__linux__
+CHECKFLAGS	+= -mbig-endian
 
 ifeq ($(CONFIG_OPENRISC_HAVE_INST_MUL),y)
 	KBUILD_CFLAGS += $(call cc-option,-mhard-mul)