Add --disable-hardware-specific-code

Squashed commit of the following:

commit f5437102357176d0b586fd2a9906c1b752b9d354
Author: Erik Massop <e.massop@hccnet.nl>
Date:   Thu Jun 19 16:59:34 2014 +0200

    Even more careful about sse2 during autodetection

    Oops, forgot a case

commit de7ca7ddb8300cffcf954899629e0c44b289c7f7
Author: Erik Massop <e.massop@hccnet.nl>
Date:   Thu Jun 19 02:03:56 2014 +0200

    More careful about sse2 during autodetection

commit 7b4290e2e7336ee63dba6ec8d6d7ec410afe5b3b
Author: Erik Massop <e.massop@hccnet.nl>
Date:   Thu Jun 19 00:24:48 2014 +0200

    Refactor detection and enabling of sse2 and pclmul

    * Seperate detection from enabling
    * Seperate compiling support from running support
    * Always run the tests
      * This avoids having to check whether they have run
      * This fixes a bug where ac-conditional HAVE_..._SUPPORT was true
        when the corresponding test did not run. The caused compilation
        errors as the necessary flags were not set.
    * Fail to configure when compiler support required for selected
      hwdir is not available.

commit ec9365e2f6da4c85458248f62f4a49d2c9501d41
Author: thome <thome@e5c1114b-a573-4582-9dac-f72f410959ce>
Date:   Fri Nov 15 15:20:12 2013 +0000

    made enable-hardware-specific-code the default.

commit 4bb8eda61ef047d6bdb53a8fe5325f45d446fb18
Author: thome <thome@e5c1114b-a573-4582-9dac-f72f410959ce>
Date:   Tue Oct 22 17:53:26 2013 +0000

    added --disable-hardware-specific-code

    git-svn-id: svn://scm.gforge.inria.fr/svnroot/gf2x/trunk@162 e5c1114b-a573-4582-9dac-f72f410959ce
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