Revert "Fix __getreent function for Cygwin"

This reverts commit 4de8596.  It worked around a problem which was
actually introduced by patch 10a30e7 a few weeks ago.  Rather than
adding special code to the newlib version of __getreent, the followup
patch reinstantiates the original, Cygwin-only implementation of
__getreent.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Signed-off-by: Stefan Assmann <sassmann@redhat.com>

newlib/libc/reent/getreent.c

@@ -1,4 +1,5 @@
 /* default reentrant pointer when multithread enabled */
+
 #include <_ansi.h>
 #include <reent.h>
 
@@ -9,11 +10,5 @@
 struct _reent *
 _DEFUN_VOID(__getreent)
 {
-#ifdef __CYGWIN__
-  /* Utilize Cygwin's inline definition from include/cygwin/config.h
-     (note the extra underscore) */
-  return __inline_getreent ();
-#else
   return _impure_ptr;
-#endif
 }

winsup/cygwin/include/cygwin/config.h

@@ -42,7 +42,7 @@ extern "C" {
 #include "../tlsoffsets.h"
 #endif
 __attribute__((gnu_inline))
-extern inline struct _reent *__inline_getreent (void)
+extern inline struct _reent *__getreent (void)
 {
   register char *ret;
 #ifdef __x86_64__
@@ -52,7 +52,6 @@ extern inline struct _reent *__inline_getreent (void)
 #endif
   return (struct _reent *) (ret + tls_local_clib);
 }
-#define __getreent()	__inline_getreent()
 #endif  /* _COMPILING_NEWLIB */
 
 #ifdef __x86_64__