Fix missing size_t on latest stable

speech-dispatcher/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "speech-dispatcher"
-version = "0.15.0"
+version = "0.15.1"
 authors = ["Nolan Darilek <nolan@thewordnerd.info>"]
 repository = "https://gitlab.com/ndarilek/speech-dispatcher-rs"
 description = "Rusty interface to the speech-dispatcher speech synthesis library"
@@ -15,6 +15,7 @@ default = ["0_11"]
 [dependencies]
 lazy_static = "1"
 speech-dispatcher-sys = { version = "0.7", path = "../speech-dispatcher-sys" }
+libc = "0.2.125"
 
 [package.metadata.docs.rs]
 no-default-features = true

speech-dispatcher/src/lib.rs

@@ -1,5 +1,6 @@
 #![allow(non_upper_case_globals)]
 
+use libc::size_t;
 use std::{
     collections::HashMap,
     ffi::{CStr, CString},