Log Message:
(net/pbdZMQ) Updated 0.3.3 to 0.3.9

2022-12-24: Ver 0.3-9
  * Replace "sprintf()" in C.
  * Replace some ".pbd_env" from function arguments.
  * Add suppress messages to demo.

2022-10-16: Ver 0.3-8
  * Fix "strict-types" and "deprecated-non-prototype" warnings.
  * Fix "if() conditions comparing class() to string".

2022-02-04: Ver 0.3-7
  * Make a copy of './inst/zmq_copyright/*' to './src/zmqsrc'.
  * Add ZeroMQ authors to DESCRIPTION file.

2021-10-25: Ver 0.3-6
  * Change configure.ac for autoconf-2.71
  * Change tests to local in-process (inter-thread) communication transport
    "zmq_inproc".

2021-04-17: Ver 0.3-6
  * Check and add "libzmq>=4.3.0" and \ 
"-DENABLE_DRAFTS=ON" options.
  * Add more ZMQ socket options up to libzmq 4.3.4 (may not stable).

2021-02-27: Ver 0.3-6
  * Add more ZMQ socket options.
  * Add timeout for connection in tests.

2021-02-09: Ver 0.3-5
  * Update "conf.sub" and "conf.guess" from CRAN.

2020-12-13: Ver 0.3-4
  * Change "http://" to "https://".

2020-09-07: Ver 0.3-4
  * Fix warning 'char* strncpy(char*, const char*, size_t)' output truncated
    due to "-Werror=stringop-truncation" by gcc 8.3.1
  * Fix a "buf[1]" in zmq.send() call in "R_zmq_sendrecv.r"

2019-07-27: Ver 0.3-4
  * For osx, change "install.libs.R" and "zzz.r.in" for \ 
staged installation.

2019-07-10: Ver 0.3-4
  * Roll back to (R >= 3.5.0).
  * Change detection of ZeroMQ library version to "4.2.2" from \ 
"4.0.4".
  * Roll detection of ZeroMQ library version to "4.0.4".
  * Block ZeroMQ library version "4.1.6".

2019-05-03: Ver 0.3-4
  * Add "StagedInstall: FALSE" to DESCRIPTION to turn off WARNING in macos.

2019-04-26: Ver 0.3-4
  * Revmoe "^M" from "src/zmqsrc/src/condition_variable.hpp".

2019-04-01: Ver 0.3-4
  * Support REQ/REP sockets in sendfile/recvfile functions.

2019-02-18: Ver 0.3-4
  * Add "R/R_zmq_transfers.r" for transferfing files and directories.
  * Add importFrom utils for zip and unzip.
  * Remove "-Werror" from "src/zmqsrc/configure" to pass \ 
"R CMD check".

2019-02-17: Ver 0.3-4
  * Register "R_zmq_send_file" and "R_zmq_recv_file" in \ 
"src/zzz.c".
  * Fix Windows binary files transfer problems.