NEW: devel/libaio_compat

Hi ports --

Attached is a new port, devel/libaio_compat. libaio_compat is a port of
POSIX asynchronous I/O routines from DragonFly BSD.

---
pkg/DESCR:
libaio_compat is a port of the POSIX asynchronous I/O library from
DragonFly BSD to OpenBSD.

This version of AIO is aimed at standards compliance; it is not aimed at
either reasonability or performance. It merely wraps synchronous I/O
routines.
---

I submitted an earlier version of this some time ago. This new version
has the following advantages:
1. Sane version numbering (taken from the DFly release I grabbed the
code from)
2. A stable tarball location
3. A consistent name (libaio_compat.so.0.0 and aio_compat.h)

This would let me drop a number of patches from flang.

~Brian