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removing MAP_FIXED

I just added some code which should in theory enable us to remove
MAP_FIXED from the mmap calls in libpthread.  The background is that
Linux honors the address, if possible, even if MAP_FIXED is not given.
Using MAP_FIXED is wrong because it simply unmaps whatever memory
region is currently mapped in the given address which is fatal.

But it does not work (yet).  ex6 crashes if I remove MAP_FIXED (you
have to compile for a target without thread register, like i386 and
not i686).  I don't know the reason yet, will try to investigate it
further tomorrow.  In case somebody has the time to look at it while I
get some zzzs I'd love to hear about the findings.  Oh, I'm using

---------------.                          ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Red Hat          `--' drepper at   `------------------------

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