When building the source package, also exclude the compile jars, and any dist folders

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1637561 13f79535-47bb-0310-9956-ffa450edef68

build.xml

         <!-- patterns to exclude from source assemblies -->         
         <patternset id="src.dist.patterns"
             excludes="build/**,
+                      dist*/**,
                       maven/**,
                       lib/**,
+                      compile-lib/**,
                       ooxml-lib/**,
                       scripts/**,
                       TEST*,