make\arm: Fix compiling against newlib-nano by also informing the compiler we...

make\arm: Fix compiling against newlib-nano by also informing the compiler we compile with nano.specs

boards/msba2-common/Makefile.include

@@ -30,6 +30,7 @@ export LINKFLAGS += -Wl,--gc-sections
 
 # use the nano-specs of Newlib when available
 ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
+export CFLAGS += -specs=nano.specs
 export LINKFLAGS += -specs=nano.specs -lc -lnosys
 endif
 

cpu/Makefile.include.cortexm_common

@@ -95,6 +95,7 @@ include $(RIOTCPU)/cortexm_common/Makefile.include
 
 # use the nano-specs of Newlib when available
 ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
+export CFLAGS += -specs=nano.specs
 export LINKFLAGS += -specs=nano.specs -lc -lnosys
 endif