Older versions of C compilers don't like C++ comments

There's no need to exclude older compilers by putting C++ style
comments in the C API header.

Signed-off-by: AJ Lewis <aj.lewis@quantum.com>
Updated version to 3.2.3 for next stable release
Update SPEC file

Update the RPM spec file with Justin Cook's changes to fix the build for 3.2.2. (https://zeromq.jira.com/browse/LIBZMQ-473)
Change NULL to 0 to keep compatibility with some cross-compiling GCC
versions
Close inproc socket pairs on zmq_disconnect

This patch fixes LIBZMQ-476 and LIBZMQ-475
Set errno and update documentation on zmq_disconnect
Changed errno to ENOENT for disconnecting unconnected endpoints
Removal of terminated pipes from inproc and ignoring peer ends
Fixed iterator when erasing from inprocs multimap
Break early when pipe to be removed was found
Fixed rpm spec file for el5/el6 distros
Fixed newlines - fails on centos5
RPM/DEB build scripts