Fix Windows File Protection handling to use the correct system directory.

Make the stubs return success.

This allows keeping the default SIGTERM behavior of killing the whole
process.

ole32: Fix RPC_GetLocalClassObject to wait for 30 seconds, even if messages arrive while we are waiting.

safe_copy_from_buffer has the side-effect of incrementing the buffer and 
this still needs to be done when we point the memory into the buffer.

(Thanks to Maarten Lankhorst for finding the mistake and suggesting a fix.)

It is usually used during marshalling, where pStubMsg->BufferStart and 
pStubMsg->BufferEnd won't be valid. Replace it with a check using 
RpcMsg->Buffer and pStubMsg->BufferLength.