getaddrinfo: allow numeric service without any hints
This appears to correspond to what glibc does and this fixes an
issue with iptables-1.4.11 with udp and raw port numbers.
(see http://bugzilla.netfilter.org/show_bug.cgi?id=721)
This fixes #3841
https://bugs.busybox.net/show_bug.cgi?id=3841
Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>