Remove default excludes for Ant directory tasks

Besides that these default excludes get ignored when using the Cygwin terminal on Windows, they cause Ant move tasks to not remove the 'moved' directory if it contains a `.gitignore`  or other default exclude file.

Author: Pieter12345

build/build.xml

@@ -114,6 +114,22 @@
     <include name="arduino-core/lib/*.jar" />
   </fileset>
 
+  <!-- Remove all default excludes for directory tasks (see https://ant.apache.org/manual/dirtasks.html#defaultexcludes) -->
+  <defaultexcludes remove="**/.git"/>
+  <defaultexcludes remove="**/.git/**"/>
+  <defaultexcludes remove="**/.gitattributes"/>
+  <defaultexcludes remove="**/.gitignore"/>
+  <defaultexcludes remove="**/.gitmodules"/>
+  <defaultexcludes remove="**/.hg"/>
+  <defaultexcludes remove="**/.hg/**"/>
+  <defaultexcludes remove="**/.hgignore"/>
+  <defaultexcludes remove="**/.hgsub"/>
+  <defaultexcludes remove="**/.hgsubstate"/>
+  <defaultexcludes remove="**/.hgtags"/>
+  <defaultexcludes remove="**/.bzr"/>
+  <defaultexcludes remove="**/.bzr/**"/>
+  <defaultexcludes remove="**/.bzrignore"/>
+
   <target name="build" description="Build Arduino.">
     <antcall target="${platform}-build" />