Update libcoap

Makefile.dep

+ifneq (,$(filter libcoap,$(USEPKG)))
+	ifeq (,$(filter pnet,$(USEMODULE)))
+		USEMODULE += pnet
+	endif
+endif
+
 ifneq (,$(filter pnet,$(USEMODULE)))
 	ifeq (,$(filter posix,$(USEMODULE)))
 		USEMODULE += posix

Makefile.modules

@@ -4,6 +4,7 @@ UNDEF += $(BINDIR)startup.o
 USEMODULE += cpu core sys
 INCLUDES += -I$(RIOTBASE)/core/include -I$(RIOTBASE)/drivers/include -I$(RIOTBASE)/sys/include
 ED = $(USEMODULE:%=-DMODULE_%)
+ED += $(USEPKG:%=-DMODULE_%)
 EXTDEFINES = $(shell echo $(ED)|tr 'a-z' 'A-Z')
 BL=$(USEMODULE:%= $(BINDIR)%.a)
 

pkg/libcoap/Makefile

 PKG_NAME=libcoap
 PKG_URL=http://git.code.sf.net/p/libcoap/code
-PKG_VERSION=89acaa6775ca3a4aedea510557e6b9c0c01fa5db
+PKG_VERSION=ef41ce5d02d64cec0751882ae8fd95f6c32bc018
 
 ifneq ($(RIOTBOARD),)
 include $(RIOTBOARD)/$(BOARD)/Makefile.include
@@ -19,7 +19,7 @@ all: patch
 patch: $(CURDIR)/$(PKG_NAME)/Makefile
 
 $(CURDIR)/$(PKG_NAME)/Makefile: $(CURDIR)/$(PKG_NAME)
-	cd $< && git apply ../patch.txt
+	cd "$<" && git am --ignore-whitespace $(CURDIR)/*.patch || true
 
 $(CURDIR)/$(PKG_NAME)/:
 	git clone $(PKG_URL) $@ && \