pkg: move pkgdir to $BINDIRBASE/pkg/$BOARD/$PKG_NAME, do proper clean

pkg/ccn-lite/Makefile.include

-INCLUDES += -I$(RIOTPKG)/ccn-lite -I$(BINDIR)/pkg/ccn-lite/src
+INCLUDES += -I$(RIOTPKG)/ccn-lite -I$(BINDIRBASE)/pkg/$(BOARD)/ccn-lite/src
 INCLUDES += -I$(RIOTBASE)/sys/posix/include

pkg/cmsis-dsp/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/cmsis-dsp/include
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/cmsis-dsp/include

pkg/libcoap/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/libcoap \
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/libcoap \
 			-I$(RIOTBASE)/sys/posix/include \
 			-I$(RIOTBASE)/sys/net/include

pkg/micro-ecc/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/micro-ecc
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/micro-ecc

pkg/microcoap/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/microcoap
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/microcoap

pkg/oonf_api/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/oonf_api/src-api
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/oonf_api/src-api

pkg/pkg.mk

@@ -2,23 +2,29 @@
 # Include this file if your Package needs to be checked out by git
 #
 PKG_DIR?=$(CURDIR)
-PKG_BUILDDIR?=$(BINDIR)/pkg/$(PKG_NAME)
+PKG_BUILDDIR?=$(BINDIRBASE)/pkg/$(BOARD)/$(PKG_NAME)
 
 .PHONY: git-download
 
 git-download: $(PKG_BUILDDIR)/.git-downloaded
 
+GIT_APPLY_PATCHES:=if test -d "$(PKG_DIR)"/patches; then \
+	git -C "$(PKG_BUILDDIR)" am --ignore-whitespace "$(PKG_DIR)"/patches/*.patch; \
+	fi
+
 $(PKG_BUILDDIR)/.git-downloaded:
 	mkdir -p $(PKG_BUILDDIR)
 	$(GITCACHE) clone "$(PKG_URL)" "$(PKG_VERSION)" "$(PKG_BUILDDIR)"
-	if test -d "$(PKG_DIR)"/patches; then \
-		git -C "$(PKG_BUILDDIR)" am --ignore-whitespace "$(PKG_DIR)"/patches/*.patch; \
-	fi
+	$(GIT_APPLY_PATCHES)
 	touch $@
 
 clean::
-	@echo "Cleaning package $(PKG_NAME)..."
-	rm -rf "$(PKG_BUILDDIR)"
+	@test -d $(PKG_BUILDDIR) && { \
+		git -C $(PKG_BUILDDIR) clean -f ; \
+		git -C $(PKG_BUILDDIR) checkout "$(PKG_VERSION)"; \
+		$(GIT_APPLY_PATCHES) ; \
+		touch $(PKG_BUILDDIR)/.git-downloaded ; \
+	} > /dev/null 2>&1 || true
 
 distclean::
 	rm -rf "$(PKG_BUILDDIR)"

pkg/relic/Makefile.include

-INCLUDES += -I$(BINDIR)/pkg/relic/include
+INCLUDES += -I$(BINDIRBASE)/pkg/$(BOARD)/relic/include