Deal with the fact that modern compilers assume different scoping rules

Patch from Pascal Stumpf <Pascal.Stumpf@cubes.de>:

So here are all the patches that deal with the fact that modern
compilers assume different scoping rules for variables declared in for
loops.  On Linux, -fpermissive has been added as a compiler flag to
compensate for this old C code, but I think it is the wrong approach.

Sorry, couldn't help sneaking in a || defined(CSRG_BASED) and some casts
needed for other reasons ...

cde/lib/DtSvc/DtCodelibs/buf.C

@@ -118,7 +118,8 @@ _SHXbuf::reset(boolean g, boolean comp)
 char **
 _SHXbuf::vector()
 {
-    for (int i = 0; i < vec.size(); i++)
+    int i;
+    for (i = 0; i < vec.size(); i++)
 	vec[i] = &buf[long(vec[i])];
 
     vec[i] = NULL;