[patch testsuite g++]: Fixes for mingw-targets

[Rainer Orth]

Hi Kai,

> 2014-11-28  Kai Tietz  <ktietz@redhat.com>
>
>     * g++.dg/abi/mangle13.C: Disable
>     ms-extensions for mingw-targets.

just a nit: why break this line way before 72/80 charackters?  Several
more of those useless linebreaks below.  And no dash in mingw targets;
better yet use *-*-mingw* instead of paraphrasing the affected targets.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University