Remove obsolete MANIFEST.MF and build.properties checks (#433)

These checks have became obsolete after switching to Bnd for building bundles.
The build.properties file is no longer used and the MANIFEST.MF is generated which prevents the human errors that were found by the checks.

Signed-off-by: Wouter Born <github@maindrain.net>

Author: wborn

custom-checks/checkstyle/pom.xml

@@ -53,21 +53,11 @@
       <artifactId>flexmark-all</artifactId>
       <version>${flexmark.version}</version>
     </dependency>
-    <dependency>
-      <groupId>org.apache.ivy</groupId>
-      <artifactId>ivy</artifactId>
-      <version>${org.apache.ivy.version}</version>
-    </dependency>
     <dependency>
       <groupId>org.jsoup</groupId>
       <artifactId>jsoup</artifactId>
       <version>${org.jsoup.version}</version>
     </dependency>
-    <dependency>
-      <groupId>org.eclipse.pde</groupId>
-      <artifactId>org.eclipse.pde.core</artifactId>
-      <version>${pde.core.version}</version>
-    </dependency>
     <dependency>
       <groupId>org.eclipse.jdt</groupId>
       <artifactId>org.eclipse.jdt.annotation</artifactId>