[patch] Simplify allocator use

[Jonathan Wakely]

On 26/06/14 00:06 +0100, Jonathan Wakely wrote:
>This simplifies some of the test changes in my last patch, I was
>misusing the CustomPointerAlloc due to confusion with some uncommitted
>changes.

And this fixes the -fno-rtti version of make_shared, I shouldn't have
changed the deleter's parameter to the allocator's pointer. That
worked with the current test, but only because our CustomPointerAlloc
uses a custom pointer that is implicitly-convertible from value_type*.

I have a completely rewritten custom pointer for the testsuite which
doesn't support implicit conversions (only the minimum requirements)
and that caught this bug.  The new custom pointer type is proving very
useful while I'm making some std::list changes but isn't ready for
prime-time yet.

Tested x86_64-linux, committed to trunk.
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