[PATCH] Avoid expected failure of tst-malloc-thread-fail on ppc

[Florian Weimer]

ppc has a conformance issue where malloc does not return pointers with
sufficient alignment (bug 6527).  The alignment checks in
tst-malloc-thread-fail reveal this.

I believe a previous attempt to fix this has been rolled back because it
broke undump support in Emacs, so I'm working around this in the test
case.  Getting MALLOC_ALIGNMENT out of malloc.c is a bit tricky because
its definition changes between SHARED and !SHARED, so I created a new
internal header and included it from a dedicated file.

In the future, I will add additional items to <malloc-private.h> for
some whitebox testing.

Tested on powerpc-redhat-linux-gnu and x86_64-redhat-linux-gnu.

Florian
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