SSE check incorrect + strndup fix

[Christophe Massiot]

À (At) 2:05 -0700 15/06/2002, Steven M. Schultz écrivait (wrote) :

>	The SSE check in ./configure is not correct.  It is _not_ safe
>	to assume that if a  SSE instruction compiles that the OS supports
>	SSE!

That's exactly what we're doing. The test in configure just tests if 
we can _compile_ SSE (resp. MMX, Altivec, etc.) operands. Whether the 
OS (and machine) supports SSE can only be determined at runtime (and 
depends on the OS version and machine), and it is done in 
src/misc/cpu.c.

-- 
Christophe Massiot.

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