[Bug ada/113516] macro POLLPRI redefined during GNAT build

[nightstrike at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113516

--- Comment #3 from nightstrike <nightstrike at gmail dot com> ---
diff --git a/gcc/ada/s-oscons-tmplt.c b/gcc/ada/s-oscons-tmplt.c
index 6b2190578071..8391f1f8dd1c 100644
--- a/gcc/ada/s-oscons-tmplt.c
+++ b/gcc/ada/s-oscons-tmplt.c
@@ -1882,6 +1882,7 @@ CND(IF_NAMESIZE, "Max size of interface name with 0
terminator");
 #endif

 #elif defined(_WIN32)
+#undef  POLLPRI
 #define POLLPRI 0
 /*  If the POLLPRI flag is set on a socket for the Microsoft Winsock provider,
  *  the WSAPoll function will fail. */


Is this the right fix? Mingw-w64 defines it to 0x400, not 0.  Is this
indicative of anotber bug, based on the comment?  Or is the comment obsolete
and maybe it's not an issue anymore?