Patch from Nick Simon <Nick.SIMON@syntegra.bt.co.uk> to make

error.h C++ safe.

c/src/lib/libc/error.h

@@ -7,6 +7,10 @@
 #ifndef __RTEMS_ERROR_h
 #define __RTEMS_ERROR_h
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * rtems_error() and rtems_panic() support
  */
@@ -34,5 +38,10 @@ void  rtems_panic(const char *printf_format, ...);
 
 extern int rtems_panic_in_progress;
 
+#ifdef __cplusplus
+}
+#endif
+
+
 #endif
 /* end of include file */