java: add missing tool dependencies

Add missing dependencies on the jar, aapt, signapk, and zipalign
tools.

Change-Id: Ib70fdd41daf84c474f72e1219bf3d02931fcefd7
diff --git a/java/builder.go b/java/builder.go
index 6a0ae61..d4b900d 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -204,6 +204,8 @@
 	deps = append(deps, dexJarSpec.fileList)
 	jarArgs = append(jarArgs, dexJarSpec.soongJarArgs())
 
+	deps = append(deps, "$jarCmd")
+
 	ctx.Build(pctx, blueprint.BuildParams{
 		Rule:      jar,
 		Outputs:   []string{outputFile},