- QueryServiceConfig2A/W: Fail if lpBuffer is NULL but cbBufSize is not 0.

- RChangeServiceConfigW: Update the display name if it has been changed.
- RQueryServiceConfigW: Return pointers to empty strings instead of NULL pointers if information is not available.
- RQueryServiceConfig2W: Fail if lpBuffer is NULL.
- Implement RChangeServiceConfigA, RQueryServiceConfigA and RQueryServiceConfig2A.

Patch is based on bug report #3669 by bugboy <marinmnet@hotmail.com>.

svn path=/trunk/; revision=35752