[patch] Add #warning to <regex> in 4.8 branch and remove tests

[Jonathan Wakely]

How do people feel about this change, to add a #warning to the <regex>
header saying it's not implemented?

This might stop people reporting bugs that it doesn't work (we know!)
or complaining that the code shouldn't be shipped if it doesn't work.

Now that we have an implementation in the 4.9.0 release we can direct
people to that.

We might as well stop testing the non-functional code in the 4.8
branch as well (that's just 'git rm -r testsuite/28_regex' but not
shown in this patch).

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