Clean up h_errno declaration to use __thread unconditionally.

ChangeLog

@@ -1,5 +1,10 @@
 2013-08-27  Roland McGrath  <roland@hack.frob.com>
 
+	* include/netdb.h [!_ISOMAC]:
+	Don't include <tls.h>.
+	(h_errno, __libc_h_errno): Move declaration and macros out of
+	[_LIBC_REENTRANT].
+
 	* include/resolv.h [_RESOLV_H_]:
 	Don't include <tls.h>.
 	(__resp, _res): Move declaration and macro out of [_LIBC_REENTRANT].

include/netdb.h

@@ -6,17 +6,12 @@
 /* Macros for accessing h_errno from inside libc.  */
 # if !defined NOT_IN_libc || defined IN_LIB
 #  undef  h_errno
-#  ifdef _LIBC_REENTRANT
-#   include <tls.h>
-#   ifndef NOT_IN_libc
-#    define h_errno __libc_h_errno
-#   else
-#    define h_errno h_errno	/* For #ifndef h_errno tests.  */
-#   endif
-extern __thread int h_errno attribute_tls_model_ie;
+#  ifndef NOT_IN_libc
+#   define h_errno __libc_h_errno
 #  else
-extern int h_errno;
-#  endif	/* _LIBC_REENTRANT */
+#   define h_errno h_errno	/* For #ifndef h_errno tests.  */
+#  endif
+extern __thread int h_errno attribute_tls_model_ie;
 # endif /* !NOT_IN_libc || IN_LIB */
 # define __set_h_errno(x) (h_errno = (x))