Refactor UTF-8 code to common static library.

libcommon/Makefile

@@ -0,0 +1,35 @@
+R=..
+include ${R}/config.mk
+
+LOCAL_CFLAGS+=-fPIC
+LOCAL_CPPFLAGS+=
+LOCAL_LDFLAGS+=-fPIC
+LOCAL_LIBADD+=
+
+# ------------------------------------------
+#  Targets
+# ------------------------------------------
+.PHONY : really clean install
+
+OBJS= \
+	utf8_common.o
+
+all : libmosquitto_common.a
+
+install :
+
+uninstall :
+
+reallyclean : clean
+
+clean :
+	-rm -f ${OBJS} libmosquitto_common.so.${SOVERSION} libmosquitto_common.so libmosquitto_common.a *.gcno *.gcda
+
+libmosquitto_common.so.${SOVERSION} : ${OBJS}
+	${CROSS_COMPILE}$(CC) $(LOCAL_LDFLAGS) $^ -o $@ ${LOCAL_LIBADD}
+
+libmosquitto_common.a : ${OBJS}
+	${CROSS_COMPILE}$(AR) cr $@ $^
+
+${OBJS} : %.o: %.c
+	${CROSS_COMPILE}${CC} $(LOCAL_CPPFLAGS) $(LOCAL_CFLAGS) -c $< -o $@