Automatically turn on SSE2 code generation throughout Qt

...unless the user passed the -no-sse2 option to the compiler.

[ChangeLog][Important Behavior Changes] Qt now automatically generates
code for processors supporting SSE2 on i386 platforms. To disable
this, pass the -no-sse2 option during Qt configuration. Since this
feature has been present on CPUs for 10 years and since Qt no longer
checks for runtime support for SSE2, we strongly encourage users to
leave the default setting on for best performance.
 - For Linux distributions that must retain support for CPUs without
   SSE2, we recommend doing two builds of Qt and installing the
   SSE2-enabled libraries in the LIBDIR/sse2 directory. Tools,
   plugins, and examples are not affected.
 - See discussion on the Qt development mailing list:
   http://lists.qt-project.org/pipermail/development/2013-November/014085.html

Change-Id: I7f9b1f58a9f66b6e5fe295bac15f87d34343695e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

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