added version to builds
other cleanup

acinclude.m4: make kernel-specific flags cacheable

Specifically when cross-compiling, one can be willing to force these
variable values using the environment of a config.cache file. This
commit makes this possible.

The affected variables are:

* libzmq_cv_sock_cloexec
* libzmq_cv_so_keepalive
* libzmq_cv_tcp_keepcnt
* libzmq_cv_tcp_keepidle
* libzmq_cv_tcp_keepintvl
* libzmq_cv_tcp_keepalive
Signed-off-by: Lionel Orry <lionel.orry@gmail.com>

Add missing EOL at EOF.

problem: jenkins build failed

problem: client socket is missing

Problem: sockets are not thread safe

Problem: test cases are failing on slower PCs (eee PC)

Solution: raise timeouts from 100-150 msec to 250 msec

Problem: qt-android build script out of date

Solution: copy changes from latest zproject

Use GCC/Clang compiler intrinsics for atomic operations

Works with GCC and most likely clang

Code cleanup - removing unused local

Clean up of metadata_t

resolve #1325 Alignment issue with zmq_msg_t on SPARC CPU

* There is no clear reason why the map should hold const std::strings
* This class is never derived, there doesn't seem to be a compelling
  reason to ever do so, so no need to make virtual members
* In general const member data is an anti-pattern, the *only* reason
  is to prevent assignability, and the accepted idiom for that is to
  to declare the assigment operator private. This change does so, and
  also prevents copy construction.

should be backported probably

Added socket option ZMQ_INVERT_MATCHING.

ZMQ_INVERT_MATCHING reverses the PUB/SUB prefix matching. The subscription
list becomes a rejection list. The PUB socket sends messages to all
connected (X)SUB sockets that do not have any matching subscription.

Whenever the option is used on a PUB/XPUB socket, any connecting SUB
sockets must also set it or they will reject everything the publisher
sends them. XSUB sockets are unaffected because they do not filter out
incoming messages.

Fix Windows build