No error-checking of setsockopt ZMQ_CURVE_* z85 keys. Solves #1094.

Documentation fix for zmq_ctx_term

Solution: document this with a clear warning. It would be
nicer perhaps to change the default LINGER to e.g. a few
seconds. However this could break existing applications.

Fix typo: addres -> address

Problem: qt-android build doesn't fully work for downstream builds

Solution: Fix the qt-android build

Restore structure to targets lost during nonrecursive refactor.

Problem: No builtin way to build for qt-android

Solution: Don't print tar extraction verbosely

Solution: Add qt-android build system and add to travis-ci

Disable IPC testing on ipc-incapable systems in test_term_endpoint.cpp

Added test and updated documentation for unbind wild-card * binded socke...

Unbind socket with real endpoint when binding by wild-card * address

Support both --enable-eventfd and --disable-eventfd options.

Pass --with/--without-libgssapi_krb5 to configure.

Standardize optional libgssapi_krb5 dependency

Fix issue #1224

Improve build script error checking.

This commit adds a check to make sure pkg-config is present on the
computer building libzmq.
This particular line was stolen from the debian mailing list.
See https://lists.debian.org/debian-dpkg/2011/04/msg00054.html

Revert "ZMQ API diverges from POSIX"

ZMQ API diverges from POSIX

Update travis script to configure with libsodium.

Support --with and --without options for libsodium and pgm