examples: Name example exectutables "foo.exe" on Windows

We were accidentally always running the `fib-debug/main` example because of
shenanigans with alphabetical ordering and hard codeing "main.exe" as the
command we run. Now we will always compile the executable to "foo.exe" and run
that (which is similar to how we do `-o foo` on unix).

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

@@ -83,8 +83,10 @@ fn main() -> anyhow::Result<()> {
                     .arg("userenv.lib")
                     .arg("ntdll.lib")
                     .arg("shell32.lib")
-                    .arg("ole32.lib");
-                "./main.exe"
+                    .arg("ole32.lib")
+                    .arg("/LINK")
+                    .arg("/OUT:foo.exe");
+                "./foo.exe"
             } else {
                 cmd.arg("target/debug/libwasmtime.a").arg("-o").arg("foo");
                 "./foo"