QSslEllipticCurve: remove a copy when setting the curves

The only reason for copying QSslEllipticCurves into a temporary array
would be to be extra-pedantic about type safety, but in the end,
we can simply force a cast and remove the copy.

Change-Id: Ice8a036fe4b79ba438ce83b5eacf6158eb3f0ce7
Reviewed-by: Richard J. Moore <rich@kde.org>
Add Q_DECL_OVERRIDE in the src subdirectory

Done automatically with clang-modernize on linux

(But does not add Q_DECL_OVERRIDE to the function that are marked
 as inline because it a compilation error with MSVC2010)

Change-Id: I2196ee26e3e6fe20816834ecea5ea389eeab3171
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>