Can't depend on different versions of same package using configurations

[CyberShadow]

I believe this is a "known issue", but I don't see this particular variant of it filed, so here is a formal record of this particular variation of the problem.

The gist is as follows:

name "test"

configuration "a" {
	dependency "openssl" version="~>1.0"
	# ... other configuration settings ...
}
configuration "b" {
	dependency "openssl" version="~>2.0"
	# ... other configuration settings ...
}

(Any package works instead of openssl).

Attempting to build such a project results in:

Unresolvable dependencies to package openssl:
  test ~master depends on openssl ~>1
  test ~master depends on openssl ~>2

Essentially, because of how the Dub dependency resolution process works, it's not possible to support multiple major versions of a library when they also require separate configuration in dub.sdl (such as versions or libs).

[Geod24]

This is a duplicate of #1706 (essentially) but since it's likely to be an issue users encounters, let's keep it open (and pinned).

[Geod24]

Actually there is: #1217