[xserver] os: Add libsha1 as a choice of SHA1 implementation

[keith.packard]

Excerpts from Mikhail Gusarov's message of Wed Oct 28 11:40:27 -0700 2009:
> There are small systems which don't need OpenSSL or gcrypt.
> Add libsha1 (http://github.com/dottedmag/libsha1) as an alternative
> small SHA1 implementation.

This patch has the dladdr and EVIOCGRAB changes too.

-- 
keith.packard at intel.com
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