Cleanup all the remaining libc refs to use imports (#7)

* Cleanup all the remaining libc refs to use imports

* cargo fmt

Author: bobtfish

src/bin/lua.rs

@@ -1,9 +1,11 @@
+use libc::{c_char, c_int};
+
 extern "C" {
-    pub fn lua_main(argc: libc::c_int, argv: *mut *mut libc::c_char) -> libc::c_int;
+    pub fn lua_main(argc: c_int, argv: *mut *mut c_char) -> c_int;
 }
 
 fn main() {
-    let mut args: Vec<*mut libc::c_char> = Vec::new();
+    let mut args: Vec<*mut c_char> = Vec::new();
     for arg in ::std::env::args() {
         args.push(
             (::std::ffi::CString::new(arg))
@@ -14,8 +16,8 @@ fn main() {
     args.push(::core::ptr::null_mut());
     unsafe {
         ::std::process::exit(lua_main(
-            (args.len() - 1) as libc::c_int,
-            args.as_mut_ptr() as *mut *mut libc::c_char,
+            (args.len() - 1) as c_int,
+            args.as_mut_ptr() as *mut *mut c_char,
         ) as i32)
     }
 }