Stop overriding ecj to old version

Let tycho-compiler-plugin defined ecj dependency be used.

pom.xml

@@ -34,7 +34,6 @@
 		<jacoco.destFile>../target/jacoco.exec</jacoco.destFile>
 		<tycho.scmUrl>scm:git:https://github.com/eclipse-m2e/m2e-core.git</tycho.scmUrl>
 		<trimStackTrace>false</trimStackTrace>
-		<ecjVersion>3.32.0</ecjVersion>
 	</properties>
 
 	<modules>
@@ -193,13 +192,6 @@
 					<groupId>org.eclipse.tycho</groupId>
 					<artifactId>tycho-compiler-plugin</artifactId>
 					<version>${tycho-version}</version>
-					<dependencies>
-						<dependency>
-							<groupId>org.eclipse.jdt</groupId>
-							<artifactId>ecj</artifactId>
-							<version>${ecjVersion}</version>
-						</dependency>
-					</dependencies>
 				</plugin>
 				<plugin>
 					<groupId>org.eclipse.tycho</groupId>