fixed typo in xHost option

As detailed in the intel docs the right option is -xHost

https://software.intel.com/sites/products/documentation/doclib/iss/2013/compiler/cpp-lin/GUID-B5554896-8329-49D1-BE66-532D93DEAFFE.htm#GUID-B5554896-8329-49D1-BE66-532D93DEAFFE