replace Task.leftShift(Closure) with Task.doLast(Action)

build.gradle

@@ -70,9 +70,11 @@ task unpack_bootimg(type: JavaExec, dependsOn: ['abootimg:abootimg']) {
     args String.format("%s", activeImg), workdir
 }
 
-task unpack_ramdisk_gz << {
+task unpack_ramdisk_gz {
+    doLast {
         unGnuzipFile(workdir+"/ramdisk.img.gz", workdir + "/ramdisk.img")
     }
+}
 unpack_ramdisk_gz.dependsOn(unpack_bootimg)
 
 task unpack_cpio(type: Exec, dependsOn: unpack_ramdisk_gz) {
@@ -174,9 +176,11 @@ void gnuZipFile(String compressedFile, String decompressedFile) throws IOExcepti
     }
 }
 
-task verify_clear(dependsOn: ['abootimg:pack_clear', 'abootimg:pack_clear2', 'abootimg:pack_clear3']) << {
+task verify_clear(dependsOn: ['abootimg:pack_clear', 'abootimg:pack_clear2', 'abootimg:pack_clear3']) {
+    doLast {
         verifyClearImages(activeImg + ".clear", activeImg + ".clear2", activeImg + ".clear3");
     }
+}
 
 task pack(type: JavaExec, dependsOn: [verify_clear, 'boot_signer:jar']) {
     main = 'com.android.verity.BootSignature'
@@ -244,17 +248,21 @@ void updateBootImage(String activeImg) {
     Run(cmd2)
 }
 
-task flash << {
+task flash {
+    doLast {
         updateBootImage(activeImg)
     }
+}
 
 void rebootRecovery() {
     Run("adb reboot recovery")
 }
 
-task rr << {
+task rr {
+    doLast {
         rebootRecovery()
     }
+}
 
 void updateLinks(String inWorkdir) {
     updateLinks(inWorkdir, 6);