PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
64-bit ${eval} (JH/03).
+PP/36 Define _ISOC99_SOURCE in exim.h; it's needed for some releases of
+ GNU libc to support some of the 64-bit stuff, should not lead to
+ conflicts. Defined before os.h is pulled in, so if a given platform
+ needs to override this, it can.
+
Exim version 4.77
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