[perl #34549] atan2() isn't IEEE compliant on OpenBSD/*BSD/Cygwin/Solaris

[Andy Dougherty via RT]

Well, it's not really completely resolved, but I couldn't think  of a
better status for it.  The *BSD versions are resolved, and Solaris is
half-resolved (works with Sun's cc, fails with gcc).

This issue is now listed in Trac as TT #205, so we can close the RT
version of the ticket and keep the Trac version open.