[Rivet] --no-as-needed only exists for ELF linkers

[Hendrik Hoeth]

Thus spake Andy Buckley (andy.buckley at cern.ch):

> What was the motivation for it?

Linking libfastjettools to a plugin didn't actually pull the needed
stuff in without the flag.

> For all other flags we check them first via the configure script... do
> we really require --no-as-needed in plugin building on Linux?

At least it didn't work without it ...

-- 
If your dreams don't scare you, then you are not dreaming big enough.