Use ProjectedFSLib.{h,lib} from Windows SDK

Windows SDK contains `projectedfslib.h` (lowercase) and `ProjectedFSLib.lib` (pascal-case).
As everything in case-insensitive here, I am using `ProjectedFSLib` spelling everywhere.

build/sysincl/windows.yml

@@ -181,6 +181,7 @@
   - processthreadsapi.h
   - processtopologyapi.h
   - profileapi.h
+  - projectedfslib.h
   - provider.h
   - psapi.h
   - pshpack1.h