OpenBSD kqueue EV_RECEIPT and EV_DISPATCH

OpenBSDs kqueue now has EV_RECEIPT and EV_DISPATCH.

I wrote a patch and the devs merged it into current:
https://marc.info/?l=openbsd-tech&m=149621427511219&w=2

This change extends the rust libc crate to provide the feature.

Author: jan-schreib

src/unix/bsd/netbsdlike/openbsdlike/mod.rs

@@ -431,6 +431,8 @@ pub const EV_ENABLE: ::uint16_t = 0x4;
 pub const EV_DISABLE: ::uint16_t = 0x8;
 pub const EV_ONESHOT: ::uint16_t = 0x10;
 pub const EV_CLEAR: ::uint16_t = 0x20;
+pub const EV_RECEIPT: ::uint16_t = 0x40;
+pub const EV_DISPATCH: ::uint16_t = 0x80;
 pub const EV_FLAG1: ::uint16_t = 0x2000;
 pub const EV_ERROR: ::uint16_t = 0x4000;
 pub const EV_EOF: ::uint16_t = 0x8000;