hghave: use strings instead of floats for version numbers passed to checkvers
I think it’s a really bad idea to use floats for version numbers. One problem
is that 3.10 is the same as 3.1.
fn main() {
cc::Build::new()
.warnings(true)
.file("src/sendfds.c")
.file("src/sighandlers.c")
.compile("procutil");
}