Document that the socketpair tests are unhappy in old SCO,
as per [perl #18537].
p4raw-link: @18361 on //depot/maint-5.8/perl:
4096d0de323484cdb8e1bff9fd6221ce48264172
p4raw-id: //depot/perl@18460
p4raw-integrated: from //depot/maint-5.8/perl@18459 'copy in'
pod/perl58delta.pod (@18173..)
formatting 0.6 and -0.6 using the printf format "%.0f"; most often,
they produce "0" and "-0".)
+=head2 SCO
+
+The socketpair tests are known to be unhappy in SCO 3.2v5.0.4:
+
+ ext/Socket/socketpair.t...............FAILED tests 15-45
+
=head2 Solaris 2.5
In case you are still using Solaris 2.5 (aka SunOS 5.5), you may