Makefile: drop -D__CHECK_ENDIAN__ from cflags

That's the default now, no need for makefiles to set it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>

drivers/net/wireless/intel/iwlegacy/Makefile

@@ -13,5 +13,3 @@ iwl4965-$(CONFIG_IWLEGACY_DEBUGFS) += 4965-debug.o
 obj-$(CONFIG_IWL3945)	+= iwl3945.o
 iwl3945-objs		:= 3945-mac.o 3945.o 3945-rs.o
 iwl3945-$(CONFIG_IWLEGACY_DEBUGFS) += 3945-debug.o
-
-ccflags-y += -D__CHECK_ENDIAN__