removed tmpfile form ptexlib.h (thanks to A. Kakuto).

source/texk/web2c/luatexdir/ptexlib.h

@@ -42,11 +42,6 @@ ptexlib.h must be included first!!!
 extern double rint(double x);
 #  endif
 
-#  ifdef _WIN32
-extern FILE *_cairo_win_tmpfile(void);
-#define tmpfile _cairo_win_tmpfile
-#  endif
-
 #  if defined(WIN32) || defined(__MINGW32__) || defined(__CYGWIN__)
 extern char **suffixlist;       /* in luainit.w */
 #  endif