rust/chg/build.rs

sparse-revlog: stop using a heap to track gaps

The heap doesn't bring any performance advantage as we can simply sort the
final list.

Moreover, the lesser complexity helps a lot when we later implement it in C.

extern crate cc;

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