Add annotation processors for compiler avoidance.

This is done to speed up builds by avoiding recompilation of all sources
when making non-ABI changes. This also optimizes the Gradle Enterprise
build caching infrastructure.

pom.xml

@@ -391,6 +391,19 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-assembly-plugin</artifactId>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<annotationProcessorPaths>
+						<path>
+							<groupId>org.apache.logging.log4j</groupId>
+							<artifactId>log4j-core</artifactId>
+							<version>${log4j}</version>
+						</path>
+					</annotationProcessorPaths>
+				</configuration>
+			</plugin>
 		</plugins>
 	</build>