configure.ac: roll up a program for the sse4.1 check

So when checking/building sse code we have three possibilities:
 1 Old compiler, throws an error when using -msse*
 2 New compiler, user disables sse* (-mno-sse*)
 3 New compiler, user doesn't disable sse

The original code, added code for #1 but not #2. Later on we patched
around the lack of handling #2 by wrapping the code in __SSE4_1__.
Yet it lead to a missing/undefined symbol in case of #1 or #2, which
might cause an issue for #2 when using the i965 driver.

A bit later we "fixed" the undefined symbol by using #1, rather than
updating it to handle #2. With this commit we set things straight :)

To top it all up, conventions state that in case of conflicting
(-enable-foo -disable-foo) options, the latter one takes precedence.
Thus we need to make sure to prepend -msse4.1 to CFLAGS in our test.

v2: Clean the #includes. Suggested by Ilia, Matt & Siavash.

Cc: "10.3 10.4" <[email protected]>
Tested-by: David Heidelberg <[email protected]>
Tested-by: Siavash Eliasi <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>

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