[Bug 54940] Import library generation is much slower without dlltool

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54940

--- Comment #2 from Rémi Bernon  ---
I don't see what we can do about it, we need separate objects so that only the
used symbols are pulled in and there doesn't seem to be a way to assemble
multiple files into separate objects in one invocation.

It also doesn't look realistic to write the archive directly, delay imports use
small thunks and we would have to hardcode their binary form, which doesn't
look very appealing.

If the time it takes really is an issue, I can only suggest to switch to a more
compatible toolchain, like LLVM, or maybe use its linker instead of GNU ld, but
I don't think import libs are rebuilt so often.