This commit adds a ZMQ_POLLPRI flag that maps to poll()'s POLLPRI
flag.
This flags does nothing for OMQ sockets. It's only useful for raw
file descriptor (be it socket or file).
This flag does nothing if poll() is not the underlying polling
function. So it is Linux only.

PVS Studio small fix

Fix V815 Decreased performance. Consider replacing the expression 'peer_address = ""' with 'peer_address.clear()'. stream_engine.cpp 99

Fix V815 Decreased performance. Consider replacing the expression 'options.socks_proxy_address != ""' with '!options.socks_proxy_address.empty()'. session_base.cpp 497

Fix V803 Decreased performance. In case 'it' is iterator it's more effective to use prefix form of increment.
    Replace iterator++ with ++iterator. stream_engine.cpp
    http://www.viva64.com/en/d/0165/print/

Remove build and runtime dependencies on uuid and uuid-devel.

Fix up spec build

Signed-off-by: Dan Mick <dmick@redhat.com>

Signed-off-by: Dan Mick <dmick@redhat.com>

Signed-off-by: Dan Mick <dmick@redhat.com>

Signed-off-by: Dan Mick <dmick@redhat.com>

Signed-off-by: Dan Mick <dmick@localhost.localdomain>

Signed-off-by: Dan Mick <dmick@redhat.com>

Signed-off-by: Dan Mick <dmick@redhat.com>

Problem : Build failed with MinGW on windows

Update NuGet package.

Problem: curve messages can be replayed

Solution: ensure message short nonces are strictly increasing and validate them

Problem: stream_engine.cpp security can be downgraded

Solution: accept only the mechanism defined by the socket options.

I've not tested this yet, so it's a speculative fix.

Problem: test_security_curve does't try wrong mechanisms

Solution: check that it rejects attempts to connect to a CURVE server
using NULL or PLAIN client.

Fix hang terminating PGM ZMQ_SUB (#822).

Fix non-constant-expression narrowing

For OS X, the microseconds field is implemented as an int type. The implicit narrowing in the initializer list throws a compiler error for some compilers with C++11 support turned on. The specific error message is: "error: non-constant-expression cannot be narrowed from type 'long' to '__darwin_suseconds_t' (aka 'int') in initializer list [-Wc++11-narrowing]".

Tested on Clang 5.1.0 and Mac OS X 10.9.4.

Stop session's timer when pipe terminates

Update nuget package.

Code cleanup

Problem: undocumented limit on IPC paths in Linux is 107 chars

Solution: document the limit of 113 chars including ipc://. We might
fix this in libzmq by shortening an over-long IPC pathname into a
unique string; so long as this is done consistently in bind and in
connect, it will save applications from weird failures when they
use external data to generate IPC pathnames.

Fix configure warning.

Clean up after using randombytes from libsodium