MSVC link /INCREMENTAL - does this actually work?

[Michael Stahl]

i've tried to get the MSVC 2008 linker to do incremental linking, see
the attached patch.

the linker is very picky and spits out an error message that it does a
full link if anything touches the .dll or .ilk file and modifies the
timestamp after it was linked.

but with the patch i don't get that error message for DLLs any more, but
still the linking does not seem to happen any faster.

i've tried in vcl and tookit modules, in an --enable-pch
--enable-dbgutil build, touch a single file and rebuild the module,
roughly as fast with incremental as without.

when i add -verbose to the linker options, i see what looks like
something adds additional parameters, among them a "/fullbuild" that is
documented nowhere apparently.  it's a mystery what is going on there.

maybe somebody more familiar with MSVC has some insight into this that
i'm missing (also i haven't got MSVC 2010 or 2012 installed so don't
know what happens there).
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