coverity#982297 EBCDIC-related cleanup

Change-Id: I8da7911c342ffe114d7b25b996602aabed7aa1ed

rsc/source/rscpp/cpp4.c

@@ -49,8 +49,7 @@ void InitCpp4()
  * the formal parameter name is encountered in the replacement
  * string, it is replaced by a character in the range 128 to
  * 128+NPARAM (this allows up to 32 parameters within the
- * Dec Multinational range).  If cpp is ported to an EBCDIC
- * machine, you will have to make other arrangements.
+ * Dec Multinational range).
  *
  * There is some special case code to distinguish
  *      #define foo     bar

rsc/source/rscpp/cpp5.c

@@ -741,7 +741,7 @@ FILE_LOCAL int evalchar(int skip)
                    (--count >= 0))
             {
                 value *= 16;
-                value += (c >= '0') ? (c - '0') : ((c & 0xF) + 9);
+                value += (c - '0');
             }
             unget();
             break;