Updated the list of DLLs which are part of the Win32 API with
the libraries d3dcompiler_46.dll, d3dcsx_46.dll, davclnt.dll,
devmgr.dll, devobj.dll and devrtl.dll
... as requested by mikkel on IRC. Unfortunately mscoree.dll isn't part
of mingw-crt so the provides don't get picked up automatically. Adding
it manually for now.
The virtual mingw32(...) and mingw64(...) provides used to be generated
from the names of WINE DLLs. This changes it to generate the list from
mingw-crt import libs instead. The advantage with the new approach is
that we can be sure that the virtual provides match with the actual DLL
names we can end up linking with: we'll be linking with the same stubs
from mingw-crt package that are used for the virtual provides list.
