udhcpc6: rudimentary code to export data to script; fix IAADDR parsing

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/udhcp/common.h

@@ -308,6 +308,9 @@ int arpping(uint32_t test_nip,
 		uint8_t *from_mac,
 		const char *interface) FAST_FUNC;
 
+/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
+int sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip) FAST_FUNC;
+
 POP_SAVED_FUNCTION_VISIBILITY
 
 #endif