[MNG-5904] Remove the whole Ant Build

Reduced minimum to build Maven itself to 3.0.5
related to Maven < 3.3.1 we have to use something
different than maven.home otherwise maven.home will
interfere with maven.home from the mvn script which
results in automatically activating the profile which
is used to create the distribution folder. Using the
different name distributionTargetFolder makes this safe.

README.md

@@ -12,12 +12,12 @@ Maven is available under the [Apache License, Version 2.0](http://www.apache.org
 If you want to bootstrap Maven, you'll need:
 
 - Java 1.7+
-- Maven 3.3.1 or later
+- Maven 3.0.5 or later
 
 Run Maven, specifying a location into which the completed Maven distro should be installed:
 
 ```
-mvn -Dmaven.home="$HOME/app/maven/apache-maven-3.4.x-SNAPSHOT" clean package
+mvn -DdistributionTargetFolder="$HOME/app/maven/apache-maven-3.4.x-SNAPSHOT" clean package
 ```
 
 Once the build completes, you should have a new Maven distro ready to roll in that directory!

apache-maven/pom.xml

@@ -185,7 +185,7 @@
       <id>create-distribution-in-folder</id>
       <activation>
         <property>
-          <name>maven.home</name>
+          <name>distributionTargetFolder</name>
         </property>
       </activation>
       <build>
@@ -203,7 +203,7 @@
                   <finalName>./</finalName>
                   <appendAssemblyId>false</appendAssemblyId>
                   <attach>false</attach>
-                  <outputDirectory>${maven.home}</outputDirectory>
+                  <outputDirectory>${distributionTargetFolder}</outputDirectory>
                   <descriptors>
                     <descriptor>src/main/assembly/dir.xml</descriptor>
                   </descriptors>

pom.xml

@@ -42,7 +42,7 @@
   <inceptionYear>2001</inceptionYear>
 
   <properties>
-    <maven.version>3.3.1</maven.version>
+    <maven.version>3.0.5</maven.version>
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
     <classWorldsVersion>2.5.2</classWorldsVersion>