Use rsplit instead of split

Co-authored-by: Chris Denton <christophersdenton@gmail.com>

src/windows/find_tools.rs

@@ -406,8 +406,8 @@ mod impl_ {
             .stderr
             .split(|&b| b == b'\n' || b == b'\r')
             .next()?
-            .split(|&b| b == b' ')
-            .last()?;
+            .rsplit(|&b| b == b' ')
+            .next()?;
 
         match cl_arch {
             b"x64" => Some("x64"),