Add a dependency for :poi-scratchpad:javadoc to :poi-ooxml:jar to avoid strange build-failures with parallel building

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1896604 13f79535-47bb-0310-9956-ffa450edef68

poi-scratchpad/build.gradle

@@ -148,6 +148,10 @@ javadoc {
     }
 }
 
+// without this dependency, parallel building sometimes fails because the javadoc
+// task tries to access a jar-file which is not yet fully built
+javadoc.mustRunAfter ':poi-ooxml:jar'
+
 javadocJar {
     metaInf {
         from("$projectDir/../legal/LICENSE")