Otherwise we'd call ZwQuerySection on an invalid handle and get:
(ntoskrnl/mm/section.c:4320) Failed to reference section: 0xc0000008
Also correctly check DllCharacteristics: If the argument is missing, the
file is _not_ a system file, i.e. we should check for restrictions.
* Remove the hacky find_actctx_dll form ldr that was taken from wine. LdrpResolveDllName and LdrpCheckForLoadedDll should get a parameter that is already redirected.
* Use RtlDosApplyFileIsolationRedirection_Ustr in LdrpLoadImportModule and LdrpUpdateLoadCount3 to redirerect the input parameter.