Disable modules.order to improve build performance.
This file is not needed for anything in LEDE

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/Makefile
+++ b/Makefile
@@ -1123,7 +1123,6 @@ all: modules
 
 PHONY += modules
 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
-	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
 	@$(kecho) '  Building modules, stage 2.';
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
@@ -1153,7 +1152,6 @@ _modinst_:
 		rm -f $(MODLIB)/build ; \
 		ln -s $(CURDIR) $(MODLIB)/build ; \
 	fi
-	@cp -f $(objtree)/modules.order $(MODLIB)/
 	@cp -f $(objtree)/modules.builtin $(MODLIB)/
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -92,7 +92,7 @@ modorder-target := $(obj)/modules.order
 # We keep a list of all modules in $(MODVERDIR)
 
 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
-	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
+	 $(if $(KBUILD_MODULES),$(obj-m)) \
 	 $(subdir-ym) $(always)
 	@: