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avoid a "FILE" name conflict with cygwin's wchar.h
The 1.7.28 release of cygwin (or possible a separate package released
around the same time) header wchar.h includes the following code:
typedef __FILE FILE;
With PERLIO_NOT_STDIO set to true, the default for core source files, we
#include nostdio.h which does:
struct _FILE;
#define FILE struct _FILE
which turns the above code into:
typedef __FILE struct _FILE;
which isn't C.
Disable this hack for cygwin.c