static build for merge tool

[batesj]

I tried some hacking in the cmake build files, but some of the library deps are shared so might be a bit more work needed.

A static build would just be more convenient to redistribute along with a script to record/merge host+guest traces.

[741g]

That seems like a good idea; I'll try to find some time to get to it but I was thinking the vperfetto lib itself could have a static variant and then we could link that in. The issue is probably going to be around stdc++fs.