_XOPEN_SOURCE set but not unset

[Graham Nash]

I was having problems with _XOPEN_SOURCE being defined by pth.h (v 2.0.0) with 
the subsequent disaster of various structures in netdb.h on one of my platforms 
being masked out. The following patch switches off the flag if it was not 
previously set.

Not very critical though there may be other variables that should be similarly 
treated. I was too lazy to check. Sorry.

--g

*** pth.h.in.orig    Fri Jan 30 16:56:09 2004
--- pth.h.in    Fri Jan 30 16:56:21 2004
***************
*** 338,345 ****
--- 338,351 ----
 #define PTH_FAKE_POLL @PTH_FAKE_POLL@
 #if !(PTH_FAKE_POLL)
 /* use vendor poll(2) environment */
+ #ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE 500
+ #define _XOPEN_SOURCE_set
+ #endif
 #include <poll.h>
+ #ifdef _XOPEN_SOURCE_set
+ #undef _XOPEN_SOURCE
+ #endif
 #ifndef POLLRDNORM
 #define POLLRDNORM POLLIN
 #endif


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