The libuv filesystem events API on AIX requires the non-default IBM
`bos.ahafs` package to be installed. The library should still compile
and work on systems without this package. This patch adds proper
detection to `configure.ac` and makes the API return `-ENOSYS` at
runtime if the system does not support it.
PR-URL: https://github.com/libuv/libuv/pull/372
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
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