mac80211: use KERNEL_MAKEOPTS instead of KERNEL_MAKE_FLAGS

Fixes issues with disabling stack validation on non-linux systems

Signed-off-by: Felix Fietkau <[email protected]>

package/kernel/mac80211/Makefile

@@ -426,8 +426,8 @@ ifeq ($(BUILD_VARIANT),smallbuffers)
 	C_DEFINES+= -DCONFIG_ATH10K_SMALLBUFFERS
 endif
 
-MAKE_OPTS:= -C "$(PKG_BUILD_DIR)" \
-	$(KERNEL_MAKE_FLAGS) \
+MAKE_OPTS:= \
+	$(subst -C $(LINUX_DIR),-C "$(PKG_BUILD_DIR)",$(KERNEL_MAKEOPTS)) \
 	EXTRA_CFLAGS="-I$(PKG_BUILD_DIR)/include $(IREMAP_CFLAGS) $(C_DEFINES)" \
 	KLIB_BUILD="$(LINUX_DIR)" \
 	MODPROBE=true \