build: have scripts/feeds honor all toplevel .mk-files of a feed

The luci and freifunk feed having a common Makefile included by the
individual packages. Currently a change to this file will be ignored
when running "scripts/feeds update".
When we are updating for a feed, add a dependency for all .mk files
in the root of it.

Signed-off-by: Sven Roederer <devel-sven@geroedel.de>

include/scan.mk

@@ -12,10 +12,17 @@ OVERRIDELIST:=$(TMP_DIR)/info/.overrides-$(SCAN_TARGET)-$(SCAN_COOKIE)
 
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
+define feedname
+$(if $(patsubst feeds/%,,$(1)),,$(word 2,$(subst /, ,$(1))))
+endef
+
 ifeq ($(SCAN_NAME),target)
   SCAN_DEPS=image/Makefile profiles/*.mk $(TOPDIR)/include/kernel*.mk $(TOPDIR)/include/target.mk image/*.mk
 else
   SCAN_DEPS=$(TOPDIR)/include/package*.mk
+ifneq ($(call feedname,$(SCAN_DIR)),)
+  SCAN_DEPS += $(TOPDIR)/feeds/$(call feedname,$(SCAN_DIR))/*.mk
+endif
 endif
 
 ifeq ($(IS_TTY),1)
@@ -34,10 +41,6 @@ else
   endef
 endif
 
-define feedname
-$(if $(patsubst feeds/%,,$(1)),,$(word 2,$(subst /, ,$(1))))
-endef
-
 define PackageDir
   $(TMP_DIR)/.$(SCAN_TARGET): $(TMP_DIR)/info/.$(SCAN_TARGET)-$(1)
   $(TMP_DIR)/info/.$(SCAN_TARGET)-$(1): $(SCAN_DIR)/$(2)/Makefile $(foreach DEP,$(DEPS_$(SCAN_DIR)/$(2)/Makefile) $(SCAN_DEPS),$(wildcard $(if $(filter /%,$(DEP)),$(DEP),$(SCAN_DIR)/$(2)/$(DEP))))