Driver: use the canonical static library naming

On Windows, static libraries are named lib<name>.lib while import libraries are
named <name>.lib.  Use the appropriate naming on itanium and msvc environments.
This is setup properly so that if a dynamic builtins is used on Windows, it
would do the right thing, although this is not currently wired through the
driver (i.e. there is no equivalent to -{shared,static}-gcc).

llvm-svn: 280169