Allow for remembered preference between gnu and musl

[gdevenyi]

Often projects offer both a gnu(libc) and musl binary. I would always prefer the musl binary. I'd like to be able to "add" that as a component of the filtering (see #52 for other filterint improvements)

[ristomatti]

I'm stuck with Ubuntu 20.04 from lazyness. Due to it's old GLIB version, I also have to install the MUSL variant increasingly often. Sadly, with some packages the MUSL variant is significantly slower (e.g. bootandy/dust). After I noticed this, I've made the habit of first trying the GNU version, then go with MUSL if it doesn't run.

Ideally I'd prefer a binary package manager that would somehow be able to do the trial/error cycle automatically. 😜