ALL: Avoid name space collision for the global variable PC when readline is dynamically loaded in many simulators.

I7094/i7094_defs.h

@@ -38,6 +38,10 @@
 
 #include "sim_defs.h"                                   /* simulator defns */
 
+/* Rename of global PC variable to avoid namespace conflicts on some platforms */
+
+#define PC PC_Global
+
 #if defined(USE_ADDR64)
 #error "7094 does not support 64b addresses!"
 #endif