BUG#37694461 Commands out of sync after executing JavaScript [post-fix]

Fixing windows build.

Change-Id: I935ee89599fc39378f310c03e6dfb45bb5af8287

Author: rennox

router/src/harness/include/mysql/harness/scoped_callback.h

@@ -29,9 +29,11 @@
 #include <functional>
 #include <utility>
 
+#include "harness_export.h"
+
 namespace mysql_harness {
 
-class ScopedCallback {
+class HARNESS_EXPORT ScopedCallback {
  public:
   explicit ScopedCallback(std::function<void()> c) noexcept
       : callback_{std::move(c)} {}

router/src/jit_executor/src/jit_executor_context_pool.h

@@ -92,8 +92,9 @@ class Pool {
       T item = m_item_factory(m_created_items);
       increase_active_items();
       return item;
-    } catch (const std::runtime_error &err) {
-      // An initialization failure would raise this exception
+    } catch (const std::runtime_error &) {
+      // An initialization failure would raise this exception, no action is
+      // needed
       return {};
     }
   }