Solarish: missing declaration of port_send and port_sendn

[batrla]

Two functions from Event port framework are missing in libc crate on Solaris. Main functions like port_create, port_associate, port_dissociate, port_get and port_getn are present.

Expected: libc crate on Solaris contains declaration of functions port_send and port_sendn
Actual: libc crate on Solaris is missing declaration of functions port_send and port_sendn

From port_send(3C):

NAME
       port_send,  port_sendn - send a user-defined event to a port or list of ports

SYNOPSIS
       #include <port.h>

       int port_send(int port, int events, void *user);


       int port_sendn(int ports[], int errors[], uint_t nent,
            int events, void *user);

More info:
https://docs.oracle.com/cd/E88353_01/html/E37843/port-send-3c.html

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @gnzlbg (or someone else) soon.

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[alexcrichton]

Thanks for the PR here, but right now there's not many maintainers to help merge this, so it may take awhile.

[JohnTitor]

Overall looks good, also could you rebase to check current CI status?

[batrla]

all tests green, thanks for fixing CI

[JohnTitor]

Thanks!