Generate xlat/*.in files

Automatically convert xlat structures from *.c files to xlat/*.in files
using "./generate_xlat_in.sh *.c" command.
diff --git a/xlat/sockipv6options.in b/xlat/sockipv6options.in
new file mode 100644
index 0000000..7808ae0
--- /dev/null
+++ b/xlat/sockipv6options.in
@@ -0,0 +1,21 @@
+IPV6_ADDRFORM
+MCAST_FILTER
+IPV6_PKTOPTIONS
+IPV6_MTU
+IPV6_V6ONLY
+IPV6_PKTINFO
+IPV6_HOPLIMIT
+IPV6_RTHDR
+IPV6_HOPOPTS
+IPV6_DSTOPTS
+IPV6_FLOWINFO
+IPV6_UNICAST_HOPS
+IPV6_MULTICAST_HOPS
+IPV6_MULTICAST_LOOP
+IPV6_MULTICAST_IF
+IPV6_MTU_DISCOVER
+IPV6_RECVERR
+IPV6_FLOWINFO_SEND
+IPV6_ADD_MEMBERSHIP
+IPV6_DROP_MEMBERSHIP
+IPV6_ROUTER_ALERT