rpcrt4: Factor out string validation from NDR unmarshalling functions into a separate function, validate_string_data.

Do so by calculating the alignment of members when iterating through
the structures and adding it onto the buffer and memory offsets.

Only call type_memsize once elsewhere in the embedded pointer
processing functions since the return value will be the same from the
second call.

Currently we only check if ARB_HALF_FLOAT_PIXEL is supported. This is
not enough, we need ARB_TEXTURE_FLOAT as well. This fixes some errors
when running the d3d9 visual test with Mesa swrast.

Both WINED3DUSAGE_OVERLAY and WINED3DUSAGE_QUERY_SRGBBLEND were using
the same value. All usage flags except for OVERLAY are directly mapped
to d3d9, so give OVERLAY its own value.

wined3d: Update the Nvidia driver version to 173.41 and also put it in the right format e.g. 7.15.11.7341 instead of 7.15.10.17341.

Move fBufferValid to a bitfield and update the corresponding tests in rpcrt4.
Add tests for the new fields.

ole32: Include compobj_private.h in oleobj.c to type-check the function signatures of DataAdviseHolder_OnConnect and DataAdviseHolder_OnDisconnect.

ole32: Include ole2.h in ole32_main.c to type-check the function signature of OleMetafilePictFromIconAndLabel.