[PATCH] glob: Avoid copying the d_name field of struct dirent [BZ #19779]

[Florian Weimer]

Introducing a new struct makes it unnecessary to copy the name out of
the dirent structure.   The name is subsequently allocated on the heap
anyway.

I extended the existing test with a long name.  The test now crashes
before the fix.

We should split sysdeps/unix/sysv/linux/i386/glob64.c into multiple
files, rather than including posix/glob.c multiple times.

DIRENT_MUST_BE can be removed, but that's an unrelated cleanup (it was
dead before).

Florian
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