Description of problem:

fedora-32 will ship with gcc-10.

Compiling with gcc-10-20191219 snapshot reveals dupe defns of
cli_default_conn_timeout and cli_ten_minutes_timeout in
.../cli/src/cli.[ch] due to missing extern decl.

gcc-10 no longer puts globals in the "common" section.

See https://review.gluster.org/#/c/glusterfs/+/23956/


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