dosfstools: make sure install targets aren't run everytime

Adding real targets to $(TARGETS) doesn't work, since they are
prefixed __real_tgt by the main Makefile. 'make' then always thinks
that these targets aren't up-to-date, and re-generate them every time.

Therefore, we switch dosfstools to the more common way of handling
packages, with a phony target added to $(TARGETS), this phony target
depending on real targets.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dosfstools/dosfstools.mk

@@ -32,7 +32,8 @@ $(DOSFSTOOLS_DIR)/.built : $(DOSFSTOOLS_DIR)/.unpacked
 	$(STRIPCMD) $(DOSFSTOOLS_DIR)/$(DOSFSLABEL_BINARY)
 	touch $@
 
-$(TARGET_DIR)/$(MKDOSFS_TARGET_BINARY): $(DOSFSTOOLS_DIR)/.built
+$(TARGET_DIR)/$(MKDOSFS_TARGET_BINARY): # $(DOSFSTOOLS_DIR)/.built
+	echo foo
 	cp -a $(DOSFSTOOLS_DIR)/$(MKDOSFS_BINARY) $@
 	touch -c $@
 
@@ -44,7 +45,20 @@ $(TARGET_DIR)/$(DOSFSLABEL_TARGET_BINARY): $(DOSFSTOOLS_DIR)/.built
 	cp -a $(DOSFSTOOLS_DIR)/$(DOSFSLABEL_BINARY) $@
 	touch -c $@
 
-dosfstools: $(TARGET_DIR)/$(DOSFSTOOLS_TARGET_BINARY) $(TARGET_DIR)/$(DOSFSCK_TARGET_BINARY)
+DOSFSTOOLS=
+ifeq ($(BR2_PACKAGE_DOSFSTOOLS_MKDOSFS),y)
+DOSFSTOOLS+=$(TARGET_DIR)/$(MKDOSFS_TARGET_BINARY)
+endif
+
+ifeq ($(BR2_PACKAGE_DOSFSTOOLS_DOSFSCK),y)
+DOSFSTOOLS+=$(TARGET_DIR)/$(DOSFSCK_TARGET_BINARY)
+endif
+
+ifeq ($(BR2_PACKAGE_DOSFSTOOLS_DOSFSLABEL),y)
+DOSFSTOOLS+=$(TARGET_DIR)/$(DOSFSLABEL_TARGET_BINARY)
+endif
+
+dosfstools: $(DOSFSTOOLS)
 
 dosfstools-clean:
 	rm -f $(TARGET_DIR)/$(MKDOSFS_TARGET_BINARY)
@@ -60,14 +74,6 @@ dosfstools-dirclean:
 # Toplevel Makefile options
 #
 #############################################################
-ifeq ($(BR2_PACKAGE_DOSFSTOOLS_MKDOSFS),y)
-TARGETS+=$(TARGET_DIR)/$(MKDOSFS_TARGET_BINARY)
-endif
-
-ifeq ($(BR2_PACKAGE_DOSFSTOOLS_DOSFSCK),y)
-TARGETS+=$(TARGET_DIR)/$(DOSFSCK_TARGET_BINARY)
-endif
-
-ifeq ($(BR2_PACKAGE_DOSFSTOOLS_DOSFSLABEL),y)
-TARGETS+=$(TARGET_DIR)/$(DOSFSLABEL_TARGET_BINARY)
-endif
+ifeq ($(BR2_PACKAGE_DOSFSTOOLS),y)
+TARGETS+=dosfstools
+endif