private combase.dll entry routine fails on win10

The client.loader test on Win8.1 and Win10 was failing due to pseudo-dll
import issues (#2145) and once fixing those it ends up pulling in
combase.dll for RoOriginateError. But, the combase.dll entry routine fails:

```
privload_call_entry: calling combase.dll entry 0x7486f550 for 1
<...>
redirect_GetModuleHandleA: rpcrt4.dll => 0x779c0000
redirect_GetProcAddress: 0x779c0000I_RpcInitNdrImports
drwinapi_redirect_getprocaddr: I_RpcInitNdrImports => 0x77a01710
nt_raw_OpenKey failed, res: c0000034
<...>
privload_load_finalize: entry routine failed
```

Ignoring it: client.loader continues and finishes, so going with that until
we see symptoms that its failure matters.