Disable Aop auto-config if aspectjweaver is not present

This commit adds an additional class check to AopAutoConfiguration as
it is main role is to configure `@EnableAspectJAutoProxy` which won't
work properly if `aspectjweaver` is not present.

Closes gh-9880

Author: snicoll

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/aop/AopAutoConfiguration.java

@@ -18,6 +18,7 @@
 
 import org.aspectj.lang.annotation.Aspect;
 import org.aspectj.lang.reflect.Advice;
+import org.aspectj.weaver.AnnotatedElement;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
@@ -39,7 +40,7 @@
  * @see EnableAspectJAutoProxy
  */
 @Configuration
-@ConditionalOnClass({ EnableAspectJAutoProxy.class, Aspect.class, Advice.class })
+@ConditionalOnClass({ EnableAspectJAutoProxy.class, Aspect.class, Advice.class, AnnotatedElement.class })
 @ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
 public class AopAutoConfiguration {