[zeromq-dev] Android support in 2.1 master

[Pieter Hintjens]

Hi all,

I've committed a full build environment for Android, extending the
work done by Ghislain Putois on http://www.zeromq.org/distro:android.
These changes were done by Bill Roberts.

The Android build patches are on 2.1 master now, I'll port them to 2.2
and 3.0 as well.

There are a few code patches to handle functions that Android doesn't
support. Mikko, I've no idea how to get a ZMQ_HAVE_ANDROID macro
defined, so it's using __ANDROID__ for now.

-Pieter