Delete unused and deprecated MD5ArtifactComparator

...as there are no usages in production code since Jan'2021 [1], when
MirrorApplication switched to use ArtifactChecksumComparator.

[1] c173ee7

Author: manandbytes

bundles/org.eclipse.equinox.p2.repository.tools/plugin.xml

@@ -117,12 +117,6 @@
       </application>
    </extension>
 
-	<extension point="org.eclipse.equinox.p2.artifact.repository.artifactComparators">		
-		<artifactComparator 
-			class="org.eclipse.equinox.p2.internal.repository.comparator.MD5ArtifactComparator"
-			id="org.eclipse.equinox.artifact.md5.comparator">
-		</artifactComparator>
-	</extension>
 	<extension point="org.eclipse.equinox.p2.artifact.repository.artifactComparators">
 		<artifactComparator
 			class="org.eclipse.equinox.p2.internal.repository.comparator.ArtifactChecksumComparator"

bundles/org.eclipse.equinox.p2.repository.tools/src/org/eclipse/equinox/p2/internal/repository/comparator/MD5ArtifactComparator.java

@@ -23,7 +23,8 @@
 import org.eclipse.core.runtime.RegistryFactory;
 import org.eclipse.equinox.internal.p2.artifact.processors.checksum.ChecksumUtilities;
 import org.eclipse.equinox.internal.p2.artifact.repository.Messages;
-import org.eclipse.equinox.p2.internal.repository.comparator.*;
+import org.eclipse.equinox.p2.internal.repository.comparator.ArtifactChecksumComparator;
+import org.eclipse.equinox.p2.internal.repository.comparator.JarComparator;
 import org.eclipse.osgi.util.NLS;
 
 /**
@@ -39,8 +40,6 @@ public class ArtifactComparatorFactory {
 	 * <ul>
 	 * <li><code>org.eclipse.equinox.p2.repository.tools.jar.comparator</code> for
 	 * {@link JarComparator}</li>
-	 * <li><code>org.eclipse.equinox.artifact.md5.comparator</code> for
-	 * {@link MD5ArtifactComparator}</li>
 	 * </ul>
 	 *
 	 * For {@link ArtifactChecksumComparator}, there is no static id that could be