Only provide an implementation for ARM at the moment, since
it requires specific assembly fragments (the standard syscall
stubs cannot be used because the child returns in a different
stack).
Merge commit 'cdb68bf8ce26448cfe173d86f1c074e167c3420f'
* commit 'cdb68bf8ce26448cfe173d86f1c074e167c3420f':
Fix getservent() so that it returns s_port in network byte order.