[xserver] add libc as a choice for SHA1 implementation

[Keith Packard]

Excerpts from Matthieu Herrb's message of Sun Nov 01 09:34:35 -0800 2009:

> +AC_CHECK_FUNCS([SHA1Init], [HAVE_LIBC_SHA1=yes])

I'd suggest AC_CHECK_FUNC instead; as far as I can tell, AC_CHECK_FUNCS
will also define HAVE_SHA1INIT. Also, can you  use HAVE_LIBC_SHA1
consistently rather than having two separate names (HAVE_LIBC_SHA1 and
HAVE_SHA1_IN_LIBC)? Yes, I know one is a preprocessor symbol and the
other is a cpp shell variable, but I think that will work anyway.

-- 
keith.packard at intel.com
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