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