Omit all non-standard stuff from <ctype.h> if __KeepNamespacePure__ is defined.

This affects the toint function and the _tolower and _toupper macros. Several other non-standard functions and macros were already being omitted.

ORCACDefs/ctype.h

@@ -81,11 +81,13 @@ int             isblank(int);
 #define isblank(c)      ((__ctype2)[(c)+1] & __blank)
 #ifndef __KeepNamespacePure__
    #define toascii(c)      ((c) & 0x7F)
+   int                     toint(char);
 #endif
-int                     toint(char);
 int                     tolower(int);
 int                     toupper(int);
-#define _tolower(c)     ((c) | 0x20)
-#define _toupper(c)     ((c) & 0x5F)
+#ifndef __KeepNamespacePure__
+   #define _tolower(c)     ((c) | 0x20)
+   #define _toupper(c)     ((c) & 0x5F)
+#endif
 
 #endif

cc.notes

@@ -1172,7 +1172,7 @@ int foo(int[42]);
 
 146. In initializers for static data, expressions where an integer with unsigned type was added to an array address (e.g. "a + 1U") would not be accepted.
 
-147. The <string.h> header includes several non-standard functions.  Their declarations should be omitted if __KeepNamespacePure__ is defined.
+147. The <string.h> and <ctype.h> headers include several non-standard functions and macros.  Their declarations and definitions should be omitted if __KeepNamespacePure__ is defined.
 
 148. When an expression that the intermediate code peephole optimizer could reduce to a constant was cast to a character type, the resulting value could be outside the range of that type.