Bill Somerville 93b2f4164a Improve the randomness of the srand seed generator
XOR:ing the time since epoch in seconds with the PID fails for processes
started every second since the PID and time increment in step regularly in
this scenario and therefore give identical seeds. Thanks to Steve K9AN for
spotting this subtle flaw.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6294 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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