rust/chg/build.rs

dirstatemap: add a common `_refresh_entry` method for dirstatemap

This method is called once a DirstateItem have been modified to apply the
change on the dirstatemap if necessary.

Each variant have a different implementation (which is … the point).

We use `addfile` for the rustmap and not `set_dirstate_item` because we need to
keep the internal counter up to date and `set_dirstate_item` does not do it.

Differential Revision: https://phab.mercurial-scm.org/D11571

fn main() {
    cc::Build::new()
        .warnings(true)
        .file("src/sendfds.c")
        .file("src/sighandlers.c")
        .compile("procutil");
}