Updated for release 4.1.0
Marked TCP and IPC filters as deprecated (ZAP)
Updated change history
Partial migration to nonrecursive make.
Remove local pgm configuration option, cleanup configure.ac, remove unused Makefile.am instances.
Merge pull request #2 from pmienk/master

Reduce automake recursion; simplify pgm dependency
Updated NEWS for #1208
Remove build and runtime dependencies on e2fsprogs and e2fsprogs-devel.
Add support for --with/--without libsodium and --with/--without pgm
command line options.
Require pkg-config, use pkg-config to pull seek libsodium.
Correct declaration of HAVE_LIBSODIUM.
Append to libzmq_la_CPPFLAGS and libzmq_la_LIBADD.
Support both --with-* and --without-* options for libsodium and pgm
Merge pull request #3 from johntconklin/master

Cherry-picked configure and rpmbuild fixes from libzmq/master
Fix issue #1224
Backported pull request #1225