Use of _XOPEN_SOURCE?

[Howland Craig D (Craig)]

Patch attached, allowing for _XOPEN_SOURCE to be empty when setting
_POSIX_C_SOURCE values in sys/features.h.  I also added two older values
for it.
 
(While I found that _POSIX_C_SOURCE can take the value 199309L, I did
not find the basis upon which that value can be set.  If someone happens
to know and could fill me in, I could add it.)
 
Craig
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