It's not used in tools at all and fits a lot better in global.
Also fix the qsimd_x86* files to have a proper copyright
header.
Change-Id: Id3d8e7cfcd7769a1ca9f3d8cf6d357a31a99ba40
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>