Make netinet/ip.h have IPTOS_MINCOST which matches what
kernel/common/linux/ip.h has to say.
Fixup gethostbyaddr() 1st arg to match what man has to say.
Change-Id: Iff9647d4a46ea88b1fc32163eb69bb9b27cdf370
In order not to conflict with the symbols defined in file
libc/netbsd/getaddrinfo.c, this patch makes the internal/helper
functions static.
Change-Id: I0f85599e0b4ce0a637d005ff1680e1805dec4380