omit warnings on javadoc generation

Author: fvarrui

build.gradle

@@ -46,7 +46,7 @@ dependencies {
 	implementation 'org.apache.commons:commons-compress:1.21'
 	implementation 'org.apache.velocity:velocity-engine-core:2.3'
 	implementation 'org.vafer:jdeb:1.9'
-	implementation 'net.jsign:jsign-core:5.0'
+	implementation 'net.jsign:jsign-core:6.0'
 	implementation 'org.redline-rpm:redline:1.2.10'
 	implementation 'edu.sc.seis.launch4j:launch4j:2.5.2'
 
@@ -72,6 +72,9 @@ targetCompatibility = JavaVersion.VERSION_1_8
 
 compileJava.options.encoding = 'UTF-8'
 
+// supress javadoc warnings
+javadoc.options.addStringOption('Xdoclint:none', '-quiet')
+
 java {
 	withSourcesJar()
 	withJavadocJar()