bindings.java : enable copyLibs task [no ci]

This commit adds a dependency on the copyLibs task to the sourcesJar and
jar tasks. This ensures that the libwhisper.so file is copied to the
correct location before the jar is built.

It also sets the executable bit on the gradlew file.

Author: danbev

bindings/java/build.gradle

@@ -25,13 +25,13 @@ sourceSets {
 }
 
 tasks.register('copyLibwhisperDynlib', Copy) {
-    from '../../build'
+    from '../../build/src'
     include 'libwhisper.dynlib'
     into 'build/generated/resources/main/darwin'
 }
 
 tasks.register('copyLibwhisperSo', Copy) {
-    from '../../build'
+    from '../../build/src'
     include 'libwhisper.so'
     into 'build/generated/resources/main/linux-x86-64'
 }
@@ -55,7 +55,12 @@ java {
     withJavadocJar()
 }
 
+sourcesJar() {
+    dependsOn copyLibs
+}
+
 jar {
+    dependsOn copyLibs
     exclude '**/whisper_java.exp', '**/whisper_java.lib'
 }
 
@@ -67,6 +72,8 @@ tasks.withType(Test) {
     useJUnitPlatform()
 }
 
+test.dependsOn copyLibs
+
 dependencies {
     implementation "net.java.dev.jna:jna:5.13.0"
     testImplementation "org.junit.jupiter:junit-jupiter:5.9.2"