lowered maximum number of threads to 2 to make test case easier.

include sched.h so test can invoke scheduler routines.

c/src/tests/psxtests/psx01/system.h

@@ -19,6 +19,7 @@
 #include <pmacros.h>
 #include <unistd.h>
 #include <errno.h>
+#include <sched.h>
 
 void *POSIX_Init(
   void *argument
@@ -37,6 +38,8 @@ void *Task_1_through_3(
 
 #define CONFIGURE_POSIX_INIT_THREAD_TABLE
 
+#define CONFIGURE_MAXIMUM_POSIX_THREADS     2
+
 #include <confdefs.h>
 
 /* global variables */