[Zlib-devel] [4/8][RFC V3 Patch] Add an x86 version of Adler32

[Jan Seiffert]

And finally an x86 version of Adler32.

it covers:
* Plain
* MMX
* SSE
* SSE2
* SSSE3
* 32 & 64 Bit
* PIC and non PIC

And features a runtime cpu detection + dispatch.
The  runtime dispatch has two versions, one simple using a function
pointer, one which checks if the selected function is out of bounds,
to protect against memory corruption (activated when _FORTIFY_SOURCE >
0)

It heavily uses inline ASM, so it's restricted to GCC (or compatible
compiler, like clang).
This gives us help from the compiler for boilerplate code, all the
fiddling with calling conventions, PIC and bit-ness of the code.

The speed numbers left out this time, to save space, i can post them separately.
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