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/programs/dtmail/libDtMail/RFC/V3BodyPart.C

@@ -328,9 +328,11 @@ V3BodyPart::checksum(DtMailEnv & error)
 static int
 countTypes(char ** types)
 {
+    int count;
+
     if (NULL == types) return 0;
 
-    for (int count = 0; *types; types++, count++) {
+    for (count = 0; *types; types++, count++) {
 	continue;
     }