use codegen, instead of build.rs, to build header file

lib/Cargo.toml

@@ -2,7 +2,6 @@
 name = "taskchampion-lib"
 version = "0.1.0"
 edition = "2018"
-build = "build.rs"
 
 [lib]
 name = "taskchampion"
@@ -17,6 +16,3 @@ anyhow = "1.0"
 
 [dev-dependencies]
 pretty_assertions = "1"
-
-[build-dependencies]
-cbindgen = "0.20.0"

lib/build.rs

@@ -1,26 +0,0 @@
-use cbindgen::*;
-
-use std::env;
-
-fn main() {
-    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
-
-    Builder::new()
-        .with_crate(crate_dir)
-        .with_config(Config {
-            language: Language::C,
-            cpp_compat: true,
-            sys_includes: vec!["stdbool.h".into(), "stdint.h".into(), "time.h".into()],
-            usize_is_size_t: true,
-            no_includes: true,
-            enumeration: EnumConfig {
-                // this appears to still default to true for C
-                enum_class: false,
-                ..Default::default()
-            },
-            ..Default::default()
-        })
-        .generate()
-        .expect("Unable to generate bindings")
-        .write_to_file("taskchampion.h");
-}