bundle-spec: properly format boolean parameter (issue6960)
This was breaking automatic clone bundle generation. This changeset fixes it and
add a test to catch it in the future.
fn main() {
// The relative paths work locally but won't if published to crates.io.
println!("cargo::rerun-if-changed=../../mercurial/bdiff.c");
println!("cargo::rerun-if-changed=../../mercurial/bdiff.h");
println!("cargo::rerun-if-changed=../../mercurial/compat.h");
println!("cargo::rerun-if-changed=../../mercurial/bitmanipulation.h");
cc::Build::new()
.warnings(true)
.file("../../mercurial/bdiff.c")
.compile("bdiff");
}