std.Target: Make DynamicLinker.standard() much stricter.

Its semantics are now documented in terms of DynamicLinker.kind(os.tag).

The idea here is two-fold:

* The term "standard" actually means something; we shouldn't return a valid
  dynamic linker path for a triple for which it hasn't *actually* been
  standardized. That's just incorrect. For example, previously, this function
  would happily return a path for x86_64-linux-androideabi, csky-macos-gnu, or
  aarch64-hurd-msvc, and other such obvious nonsense.
* Callers that use the return value from this function to do host probing (such
  as std.zig.system.detectAbiAndDynamicLinker()) can now do so with greater
  confidence because DynamicLinker.standard() will eagerly reject nonsensical
  target triples.

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