Make less version check accept a path to the less binary

src/less.rs

@@ -1,9 +1,10 @@
 #![cfg(feature = "paging")]
 
+use std::ffi::OsStr;
 use std::process::Command;
 
-pub fn retrieve_less_version() -> Option<usize> {
-    let cmd = Command::new("less").arg("--version").output().ok()?;
+pub fn retrieve_less_version(less_path: &dyn AsRef<OsStr>) -> Option<usize> {
+    let cmd = Command::new(less_path).arg("--version").output().ok()?;
     parse_less_version(&cmd.stdout)
 }