atl: Remove WINAPI on static functions where not needed.

[Francois Gouget]

Chris Robinson wrote:
[...]
> Out of curiousity, then, does this affect static functions that are used for 
> COM objects? It's typical for those to be marked as static, their address put 
> into a (possibly static) vtable struct, which is then used as a field for an 
> allocated struct passed to the user.

Functions used for COM objects are not impacted. The compiler sees that 
their address is taken and thus that they may be called from outside the 
current compilation unit. It then knows it's not allowed to change their 
calling convention and the bug is averted.

-- 
Francois Gouget
fgouget at codeweavers.com