Revert "[StdLib] Extend ReflectionHashing test to pass on Linux"

[ezephir]

This test expects consistent hash code generation on any given platform.
However String instance generate different values on Linux depending on which
version of libicu is installed, causing environment-specific test failures.

This reverts commit def419b.

The specific situation here is that we're relying on libicu's collation elements to hash strings on platforms without objective-c interop. The values for collection elements returned by icu vary depending upon the specific version of ICU, the internal collation algorithm, and the version of Unicode that's being implemented. As a result, I don't seem to be able to mimic the other tests by checking for a static answer.

I've validated this in versions 52 (in Ubuntu 14.04) and 54 (in Fedora 23). I haven't yet tried on Ubuntu 15.10, but I expect it to be from 14.04.

@moiseev @gribozavr Can either of you tell me more about this test? Is reliance on stable hashing instrumental in this test's intent or just an implementation side effect?

[gribozavr]

@ezephir The test relies on the hash codes only incidentally. The test is supposed to test the custom mirror of Dictionary -- that it indeed allows to view all key-value pairs, for example.

It would be best to rewrite the test so that it does not depend on the output order.