AMD64 math functions done

Hi all,

finally, it's done: The dietlibc math patch for x86_64.

Didn't actually test it, though... it compiles, if nothing else. And at
least the arc cosine gives resonable values.

Oh yeah, the patch for the Makefile (right at the start) makes the
dietlibc dynamic libs have some versioning information. Don't worry, not
as bloaty as the glibc with version scripts and such. Only version numbers
in the file names and sonames. When breaking binary compatibility,
increasing the major version number would be nice.

Plus, there is a new x86_64/fallocate.S. Somehow, the static libs did
link, but the dynamic libs complained about a missing fallocate().Dunno
why, this is a quick fix.

Well, enough talk. Here's the link:

http://www.hs-merseburg.de/~8mwichma/dietlibc.patch.bz2

As for the test suite: I thought of having some CAS generate a list of
argument result pairs for some functions (like sine, cosine,
logarithm,...) and have a program check whether the functions provided by
libm are at least near the given values. On my to do list! Suggestions for
resonable arguments to these functions are appreciated.

CU,
Markus
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