[v3] testsuite/ext cleanups

[Benjamin Kosnik]

>This breaks i686-pc-mingw32 bootstrap.
>
>testsuite/testsuite_abi.h includes <ext/hash_map>, and the command line
>for testsuite/testsuite_abi.cc specifies "-I.", so GCC incorrectly
>attempts to include testsuite/ext/hash_map, which is the new directory,
>which obviously won't work.

Here's a patch that should fix your bootstrap problem. Please let me
know if it resolves your issue.

tested x86/linux

-benjamin
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