[ARM, sim] Fix build error and warnings
851c0536cabb661847c45c73ebd796eb3299066b

Index: sim/arm/arminit.c
--- sim/arm/arminit.c.orig
+++ sim/arm/arminit.c
@@ -40,6 +40,10 @@ unsigned ARMul_MultTable[32] =
 ARMword ARMul_ImmedTable[4096];	/* immediate DP LHS values */
 char ARMul_BitList[256];	/* number of bits in a byte table */
 
+/* The PC pipeline value depends on whether ARM
+   or Thumb instructions are being executed.  */
+ARMword isize;
+
 /***************************************************************************\
 *         Call this routine once to set up the emulator's tables.           *
 \***************************************************************************/