Allow windows GNU toolchain cross compilation

[samcarey]

Describe the feature

I posted previously about this on the rocksdb backend.

Basically I was hoping we could relax the librocksdb-sys version, since it was blocking an important bug fix. Now it seems that the Rust 1.75 pinned versions crate has been removed and the librockdb-sys dependency for the rocksdb backend is just "0.17.1" allowing upgrade to .3 to fix the bug.

However this filesystem backend plugin still has "=0.17.1".
It seems that, if the rocksdb backend could use a newer version, the filesystem backend could too, right?

I understand Zenoh needs to be able to run on Rust 1.75, but couldn't that requirement be imposed and checked in a different way?

[milyin]

@samcarey yes, thank you for pointing this! Yes, since 1.75 compatibility requirement is imposed to zenoh and zenoh-c now, not to the whole tool set and default compiler is not 1.75 anymore, such fixed version requirements should be removed. Will do it