consistency with pthread stack min in limits.h

src/conf/sysconf.c

@@ -83,7 +83,7 @@ long sysconf(int name)
 		[_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
 		[_SC_THREAD_DESTRUCTOR_ITERATIONS] = _POSIX_THREAD_DESTRUCTOR_ITERATIONS,
 		[_SC_THREAD_KEYS_MAX] = -1,
-		[_SC_THREAD_STACK_MIN] = 2*PAGE_SIZE,
+		[_SC_THREAD_STACK_MIN] = PAGE_SIZE,
 		[_SC_THREAD_THREADS_MAX] = -1,
 		[_SC_THREAD_ATTR_STACKADDR] = -1,
 		[_SC_THREAD_ATTR_STACKSIZE] = VER,