Cygwin: drop requirement to build newlib's stdio64

Given that 64 bit Cygwin defines all file access types (off_t,
fpos_t, and derived types) as 64 bit anyway, there's no reason
left to rely on the stdio64 part of newlib.  Use base functions
and base types.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

newlib/configure.host

@@ -420,7 +420,6 @@ fi
 case "${host}" in
   *-*-cygwin*)
 	posix_dir=posix
-	stdio64_dir=stdio64
 	xdr_dir=xdr
 	;;
   *-*-netware*)

newlib/libc/include/stdio.h

@@ -67,14 +67,10 @@ typedef __FILE FILE;
 # define __FILE_defined
 #endif
 
-#ifdef __CYGWIN__
-typedef _fpos64_t fpos_t;
-#else
 typedef _fpos_t fpos_t;
 #ifdef __LARGE64_FILES
 typedef _fpos64_t fpos64_t;
 #endif
-#endif /* !__CYGWIN__ */
 
 #ifndef _OFF_T_DECLARED
 typedef __off_t off_t;

winsup/cygwin/include/cygwin/config.h

@@ -54,8 +54,6 @@ extern inline struct _reent *__getreent (void)
    Just leave them alone. */
 #define _READ_WRITE_RETURN_TYPE _ssize_t
 #define _READ_WRITE_BUFSIZE_TYPE size_t
-#define __LARGE64_FILES 1
-#define __USE_INTERNAL_STAT64 1
 #define __LINUX_ERRNO_EXTENSIONS__ 1
 #define _MB_EXTENDED_CHARSETS_ALL 1
 #define __HAVE_LOCALE_INFO__ 1

winsup/cygwin/syscalls.cc

@@ -4191,7 +4191,7 @@ gethostid (void)
 
 #define ETC_SHELLS "/etc/shells"
 static int shell_index;
-static struct __sFILE64 *shell_fp;
+static FILE *shell_fp;
 
 extern "C" char *
 getusershell ()
@@ -4210,7 +4210,7 @@ getusershell ()
   static char buf[PATH_MAX];
   int ch, buf_idx;
 
-  if (!shell_fp && !(shell_fp = fopen64 (ETC_SHELLS, "rt")))
+  if (!shell_fp && !(shell_fp = fopen (ETC_SHELLS, "rt")))
     {
       if (def_shells[shell_index])
 	return strcpy (buf, def_shells[shell_index++]);