Fix SIMD feature after change in WinRT mkspec

Set the pattern to match winrt-x86* so that SIMD feature integration
is enabled for supported mkspecs. It may need to change if we add a
winrt-x64 mkspec later on.

Change-Id: I22b34316378cfbf682e899a0800b2bbaaedf5f9d
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@digia.com>