Fix #204, redefinition of macros in PPC vxworks unit test build

Resolves build error regarding redefinition of PPC macros in the
coverage test, when building on the actual ppc/vxworks target.

This is due to the fact that the system limits.h file implicitly
provides these PPC symbols.  It does not appear that there are
any current test cases that depend on values of these symbols.

unit-test-coverage/ut-stubs/inc/PCS_arch_ppc_vxPpcLib.h

@@ -4,6 +4,29 @@
 
 #include <PCS_basetypes.h>
 
+/*
+ * When building the coverage test on an actual VxWorks target,
+ * these symbols are indirectly provided via the system limits.h file.
+ * This results in a redefinition issue if the custom PCS definitions are used.
+ */
+#if defined(_VXWORKS_OS_) && defined(__PPC__)
+
+#define PCS_PPC_MSR_EE _PPC_MSR_EE
+#define PCS_PPC_MSR_FP _PPC_MSR_FP
+#define PCS_PPC_MSR_ME _PPC_MSR_ME
+#define PCS_PPC_MSR_FE0 _PPC_MSR_FE0
+#define PCS_PPC_MSR_FE1 _PPC_MSR_FE1
+#define PCS_PPC_MSR_DR _PPC_MSR_DR
+
+#define PCS_PPC_FPSCR_VE _PPC_FPSCR_VE
+#define PCS_PPC_FPSCR_OE _PPC_FPSCR_OE
+#define PCS_PPC_FPSCR_NI _PPC_FPSCR_NI
+#define PCS_PPC_FPSCR_ZE _PPC_FPSCR_ZE
+#define PCS_PPC_FPSCR_XE _PPC_FPSCR_XE
+#define PCS_PPC_FPSCR_UE _PPC_FPSCR_UE
+
+#else
+
 /* ----------------------------------------- */
 /* constants normally defined in vxPpcLib.h */
 /* ----------------------------------------- */
@@ -22,6 +45,8 @@
 #define PCS_PPC_FPSCR_XE 0x2210
 #define PCS_PPC_FPSCR_UE 0x2220
 
+#endif
+
 
 /* ----------------------------------------- */
 /* types normally defined in vxPpcLib.h */

unit-test-coverage/ut-stubs/override_inc/arch/ppc/vxPpcLib.h

@@ -14,6 +14,13 @@
 
 #include <PCS_arch_ppc_vxPpcLib.h>
 
+/*
+ * When building the coverage test on an actual VxWorks target,
+ * these symbols are indirectly provided via the system limits.h file.
+ * This results in a redefinition issue if the custom PCS definitions are used.
+ */
+#if !defined(_VXWORKS_OS_) || !defined(__PPC__)
+
 /* ----------------------------------------- */
 /* mappings for declarations in vxPpcLib.h */
 /* ----------------------------------------- */
@@ -31,6 +38,7 @@
 #define _PPC_FPSCR_XE PCS_PPC_FPSCR_XE
 #define _PPC_FPSCR_UE PCS_PPC_FPSCR_UE
 
+#endif
 
 #define vxTimeBaseGet PCS_vxTimeBaseGet