DPC++ daily 2022-09-16

[SYCL] Fix unittests on MSVC (#6805)

This commit makes two changes:
* Fixes a cast of incompatible size in the PI mock plugin that caused a
warning on MSVC.
* Changes the definition of the captureless lambda function in the
RedefineAPI PiMock unittest to avoid MSVC considering it equal to the
function defined by the PI mock plugin.

Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>