examples: Run the correct example executable on Windows

We were accidentally always running the `fib-debug/main` example because of
shenanigans with alphabetical ordering and hard coding "main.exe" as the command
we run. Now we properly detect which example we built and run the appropriate
executable.

crates/misc/run-examples/src/main.rs

@@ -84,10 +84,14 @@ fn main() -> anyhow::Result<()> {
                     .arg("ntdll.lib")
                     .arg("shell32.lib")
                     .arg("ole32.lib");
-                "./main.exe"
+                if is_dir {
+                    "main.exe".to_string()
+                } else {
+                    format!("./{}.exe", example)
+                }
             } else {
                 cmd.arg("target/debug/libwasmtime.a").arg("-o").arg("foo");
-                "./foo"
+                "./foo".to_string()
             };
             if cfg!(target_os = "linux") {
                 cmd.arg("-lpthread").arg("-ldl").arg("-lm");