Small optimization on gradle task prepYaCyProperties

for better lifecycle detection

build.gradle

@@ -157,6 +157,7 @@ shadowJar.zip64 = true // saw build error: Execution failed for task ':shadowJar
 // read values from property file generated by storeGitComInf tool
 import org.apache.tools.ant.filters.ReplaceTokens
 task prepYaCyProperties (type: Copy) {
+    inputs.files(fileTree(sourceSets.main.java.srcDirs[0].name + "/net/yacy/peers/operation/yacyBuildProperties.java.template"))
 
     def propfile = "gitbuildnumber.properties";
     if (project.file(propfile).exists()) { // must check otherwise any action may stop after clean on this error
@@ -165,7 +166,7 @@ task prepYaCyProperties (type: Copy) {
             props.load(it)
             project.ext.filterTokens.putAll(props)
         }
-    } else { // on missing properties file use generic data
+    } else { // on missing properties file use generic data  
         logger.error("prepYaCyProperties: file " + propfile + " is missing, you should re-run storeGitComInf")
         Properties props = new Properties()
         String Dstr = new Date().format("yyyyMMDD")