rust/chg/build.rs

getrenamedfn: get copy data from context object if configured

The function returned from getrenamedfn() calls
filelog.renamed(). That won't work when storing copy metadata in the
changeset.

I've just switched to a simple implementation here. We may or may not
need to optimize it later, possibly by optimizing the callers.

No more tests fail with "--extra-config-opt
experimental.copies.read-from=compatibility)" than they did before
this patch.

Differential Revision: https://phab.mercurial-scm.org/D6162

extern crate cc;

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