windows.
Add several tests to show the correct behavior.

lpvBuffer.

can be used by both HttpSendRequest and HttpSendRequestEx.
Also allow HttpSendRequestEx to be used asynchronously.

netapi32.

Add __RPC_USER as a calling convention in winapi.

Update default driver version (nvidia).

XRender code in the X11 driver will go into an infinite loop when the 
colour bit masks are 0, so disable XRender in this case.

include the NULL terminator, so fix this.

the call to InternetCrackUrl, which concatenates the params onto the
path.
Some other minor cleanups.

Copy FUNCDESC structures returned to calling applications instead of
passing a pointer to the master structure used internally.
Call VariantInit on newly allocated memory before calling VariantCopy.

Implement Nt[Create|Open]DirectoryObject.
Change tests accordingly.

directory in LdrGetProcedureAddress.

i.e. they haven't been set yet or are clear.

Start of conformance tests for these Ds-calls.

code a bit.
Modify test case to demonstrate this.

Function always returns S_OK, even on failure.
Copy the file to the temp directory if the file exists but isn't found
by GetFileVersionInfoSize.
If bVersion is FALSE, return the language and code page identifiers of
the file, not the system.

Fix some places where a returned object was AddRef'd.
Make the search through implemented types work on all types, not just
interfaces.

oriented API (stack_get_current_symbol).
Reused the func name (stack_get_frame) for internal stack.c handling.

INTERNET_SendCallback where INTERNET_FLAG_ASYNC is already handled
properly.