Add <stdbool.h> header.

Also, revise handling of boolean constants in <types.h> so that they do not conflict with the definitions in <stdbool.h>.

ORCACDefs/stdbool.h

@@ -0,0 +1,15 @@
+/****************************************************************
+*
+*  stdbool.h - boolean type and values
+*
+****************************************************************/
+
+#ifndef __stdbool__
+#define __stdbool__
+
+#define bool _Bool
+#define true 1
+#define false 0
+#define __bool_true_false_are_defined 1
+
+#endif

ORCACDefs/types.h

@@ -27,10 +27,18 @@
 
 #define dispatcher 0xE10000L            /* tool locator dispatch address */
 
+#ifndef TRUE
 #define TRUE 1
-#define true TRUE
+#endif
+#ifndef true
+#define true 1
+#endif
+#ifndef FALSE
 #define FALSE 0
-#define false FALSE
+#endif
+#ifndef false
+#define false 0
+#endif
 
 /* RefDescriptors */
 #define refIsPointer 0x0000