redo errno handling so that it should work both in thread and non-threaded situations

libc/misc/internals/__errno_location.c

@@ -4,10 +4,7 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#include <errno.h>
-#undef errno
-extern int errno;
-libc_hidden_proto(errno)
+#include "internal_errno.h"
 
 /* psm: moved to bits/errno.h: libc_hidden_proto(__errno_location) */
 libc_hidden_proto(__errno_location)

libc/misc/internals/__h_errno_location.c

@@ -4,13 +4,7 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#define __FORCE_GLIBC
-#include <features.h>
-#include <netdb.h>
-#undef h_errno
-extern int h_errno;
-
-libc_hidden_proto(h_errno)
+#include "internal_errno.h"
 
 libc_hidden_proto(__h_errno_location)
 int * weak_const_function __h_errno_location (void)

libc/misc/internals/errno.c

@@ -1,22 +1,15 @@
-#include <features.h>
-#undef errno
-
-extern int errno;
-extern int h_errno;
+#include "internal_errno.h"
 
+#ifdef __UCLIBC_HAS_THREADS__
 libc_hidden_proto(errno)
 libc_hidden_proto(h_errno)
-
-#if 0
-/* Unfortunately, this doesn't work... */
-int h_errno __attribute__ ((section  (".bss"))) = 0;
-int errno __attribute__ ((section  (".bss"))) = 0;
-#else
-int _errno = 0;
-int _h_errno = 0;
 #endif
+int errno = 0;
+int h_errno = 0;
 
-weak_alias(_errno,errno)
+#ifdef __UCLIBC_HAS_THREADS__
+//weak_alias(_errno, errno)
 libc_hidden_def(errno)
-weak_alias(_h_errno,h_errno)
+//weak_alias(_h_errno, h_errno)
 libc_hidden_def(h_errno)
+#endif