How to check for combinations of versions

[Blatnik]

Is there any way to check for multiple conditions in a `version` 
statement?

For example, my platform may have `Version_A` and `Version_B`, 
and both versions provide some shiny feature I want to use. Is 
there some nice way to write:

```D
version (Version_A || Version_B) {
   // Use the cool feature.
} else {
   // Do something less cool but portable.
}
```

Currently I resort to something like this, but I'm curious if 
there's a nicer way to do it.

```D
version (Version_A) {
   enum Cool_Feature_Supported = true;
} else version (Version_B) {
   enum Cool_Feature_Supported = true;
} else {
   enum Cool_Feature_Supported = false;
}

...

void do_something_cool() {
   static if (Cool_Feature_Supported) {
     ...
   } else {
     ...
   }
}
```