aiccu: fix musl compatibility

- Fix redefinition of struct ethhdr
- Restrict the use of res_ninit() and res_nquery() to glibc
- Fix a warning in dn_skipname.c by declaring ns_name_skip() static
- Refresh patches

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

ipv6/aiccu/patches/400-musl-compat.patch

@@ -0,0 +1,29 @@
+--- a/common/common.h
++++ b/common/common.h
+@@ -50,6 +50,7 @@
+ #include <signal.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
++#include <sys/uio.h>
+ #include <fcntl.h>
+ 
+ #if defined(_SUNOS) || defined(_AIX) || defined(_DARWIN)
+@@ -91,7 +92,9 @@
+ 	#include <sys/select.h>
+ 
+ 	#include <net/if.h>
++#if defined(__GLIBC__) || defined(__UCLIBC__)
+ 	#include <netinet/if_ether.h>
++#endif
+ #ifdef linux
+ 	#include <netpacket/packet.h>
+ 	#include <linux/if_tun.h>
+--- a/common/dn_skipname.c
++++ b/common/dn_skipname.c
+@@ -1,5 +1,6 @@
+ #include <errno.h>
+ #include <resolv.h>
++#include <sys/types.h>
+ 
+ /* Ripped from glibc 2.4 sources. */
+