Fix function anyhow::Ok shadowing Result::Ok (esp-rs#27)

A new `anyhow` version (1.0.49) introduced a new function `Ok`.
Glob imports pulled in this new function which in turn shadowed
the `Result::Ok` variant causing build failure. This is now fixed by only 
importing what we need from anyhow.

Author: Hecatron

src/bindgen.rs

@@ -2,7 +2,7 @@ use std::ffi::OsStr;
 use std::path::{Path, PathBuf};
 use std::{env, fs};
 
-use anyhow::*;
+use anyhow::{anyhow, bail, Context, Error, Result};
 
 use crate::utils::OsStrExt;
 use crate::{cargo, cli, cmake, cmd, cmd_output, pio};

src/cargo.rs

@@ -3,7 +3,7 @@ use std::fmt::{Display, Write};
 use std::path::{Path, PathBuf};
 use std::{env, fs};
 
-use anyhow::*;
+use anyhow::{anyhow, bail, Error, Result};
 use cargo_toml::{Manifest, Product};
 use log::*;
 

src/pio.rs

@@ -8,7 +8,7 @@ use std::io::Write;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output, Stdio};
 
-use anyhow::*;
+use anyhow::{bail, Result};
 use log::*;
 use serde::de::DeserializeOwned;
 use serde::{Deserialize, Serialize};

src/python.rs

@@ -1,4 +1,4 @@
-use anyhow::*;
+use anyhow::{anyhow, Context, Result};
 
 use crate::cmd_output;