Fix linking problem when enabling thread safety on Darwin: uninitialized

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 109d7aff73bb94570b36e6d4d9e4e3119b92d970
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-08-17T04:24:23Z
Releases: 8.0.0
Fix linking problem when enabling thread safety on Darwin: uninitialized
global variables are problematic on this platform.  Simplest solution
seems to be to initialize pthread key variable to 0.  Also, rename this
variable and check_sigpipe_handler to something involving "pq" to
avoid gratuitous pollution of application namespace.

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