pkg: micro-ecc: adapt to use pkg.mk

pkg/micro-ecc/Makefile

 PKG_NAME=micro-ecc
 PKG_URL=https://github.com/kmackay/micro-ecc.git
 PKG_VERSION=b6c0cdbe7d20af48b0c2a909a66ff00b093d1542
-PKG_DIR=$(CURDIR)
-PKG_BUILDDIR=$(BINDIR)/pkg/$(PKG_NAME)
 
 ifneq ($(RIOTBASE),)
 INCLUDES += -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/sys/net/include \
 			-I$(RIOTBASE)/sys/posix/include
 endif
 
-MODULE:=$(shell basename $(CURDIR))
+.PHONY: all
 
-.PHONY: all clean patch reset
-
-all: patch
+all: download
 	make -C $(PKG_BUILDDIR)
-	make $(BINDIR)$(MODULE).a
-
-patch: $(PKG_BUILDDIR)/Makefile
-
-$(PKG_BUILDDIR)/Makefile: $(PKG_BUILDDIR)
-	cd $(PKG_BUILDDIR) && \
-	    for patch in $(PKG_DIR)/[0-9][0-9][0-9][0-9]*.patch; do git am "$${patch}" || { git am --abort; exit 1; }; done
-	touch $(PKG_BUILDDIR)/Makefile
-
-$(PKG_BUILDDIR):
-	mkdir -p $(BINDIR)/pkg && \
-	$(GITCACHE) clone "$(PKG_URL)" "$(PKG_VERSION)" "$(PKG_BUILDDIR)"
-
-clean::
-	rm -Rf $(PKG_BUILDDIR)
-
-distclean::
-	rm -rf $(PKG_BUILDDIR)
 
-#$(BINDIR)$(MODULE).a: $(BINDIR)micro-ecc_*.a
-#	mkdir -p $(BINDIR)$(MODULE); cd $(BINDIR)$(MODULE); for var in $?; do ar -x $$var; done; ar -r -c -s $(BINDIR)$(MODULE).a *.o
+include $(RIOTBASE)/pkg/pkg.mk