* debug.cc (makethread): Eliminate unneeded function call.

* miscfuncs.cc (tls_ix): Predefine.
* perthread.h (set_reent): Eliminate.
(get_reent): Ditto.
* winbase.h (my_tlsalloc): Use global stack base pointer.  Set newly allocated
location to NULL.
(my_tlssetvalue): Use global stack base pointer.
(my_tlsgetvalue): Ditto.

winsup/cygwin/miscfuncs.cc

@@ -12,7 +12,7 @@ details. */
 #include "cygerrno.h"
 #include <sys/errno.h>
 
-long tls_ix;
+long tls_ix = -1;
 
 const char case_folded_lower[] NO_COPY = {
    0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,  15,