Windows: have the user provide its own libxml2 prebuilt
Windows: have the user provide its own libxml2 prebuilt

Run cmake with "-Dlibxml_prebuilts=path\to\libxml2\install"

Signed-off-by: David Wagner <60228a510f9a76940848fa2d29321fc4edfc2119@intel.com>

01org/parameter-framework,01org/parameter-framework,clero/parameter-framework,01org/parameter-framework,dawagner/parameter-framework,krocard/parameter-framework,mgaio/parameter-framework,clero/parameter-framework,miguelgaio/parameter-framework,krocard/parameter-framework,mgaio/parameter-framework,krocard/parameter-framework,mgaio/parameter-framework,dawagner/parameter-framework,clero/parameter-framework,miguelgaio/parameter-framework,miguelgaio/parameter-framework,dawagner/parameter-framework