Add a test to make sure the saved image has the same dimensions as
original. Delete the test file when finished.

Implement the encoding function for GDI+ images so that
GdipSaveImageToStream can encode images as BMP files.

Add the correct framework for a fully-functional implementation of
image encoding (not a hack like before). Currently, only a stub for
BMP encoding is supported. New tests added as well.

Still need to implement saving the image based on the encoder
parameter.
Basic tests included.

rpcrt4: Fix the pointer level being passed into call_unmarshaller in client_do_args_old_format for base return parameters.

NdrBaseTypeUnmarshall expects a pointer to a pointer to a base type. 
pRetVal contains a pointer to a base type, so we need to pass the 
address of pRetVal into call_unmarshaller here.

Don't call memory sizing rountines to compute the size of a type, since
memory sizing routines have side effects like checking there is enough
space in the buffer for the type and incrementing the buffer pointer.
Instead, create a function which returns the necessary size of the
limited set of types we can encounter and remove call_memory_sizer which
is no longer needed.

rpcrt4: Check that the input to RPCRT4_strndupW was not NULL before assuming that the string couldn't be allocated due to lack of memory.

Don't include platform-specific information when declaring the name of
the static import libary to build. Instead, add this information in
Makeimplib.rules.in.

pszHost should just be set to pszTargetName if pszTargetName doesn't
contain any other information.

wininet: Retrieve the maximum token length from the SSP and use a buffer of that length in calls to InitializeSecurityContextW.

Otherwise, InitializeSecurityContextW could run out of space with our
small, fixed buffer and fail.

When using SSPI, pass in a NULL identity in this case so that the SSP
can try to use cached credentials.