Export jar-args.sh script to make

Export jar-args.sh in JAR_ARGS so that make doesn't have to
duplicate the sed scripts.

Test: m -j checkbuild
Bug: 64634025
Change-Id: Ia5d0a303f23b32b8ff672fc882d51d5e99316ffa

java/config/makevars.go

@@ -34,6 +34,7 @@ func makeVarsProvider(ctx android.MakeVarsContext) {
 	ctx.Strict("JAVA", "${JavaCmd}")
 	ctx.Strict("JAVAC", "${JavacCmd}")
 	ctx.Strict("JAR", "${JarCmd}")
+	ctx.Strict("JAR_ARGS", "${JarArgsCmd}")
 	ctx.Strict("JAVADOC", "${JavadocCmd}")
 	ctx.Strict("COMMON_JDK_FLAGS", "${CommonJdkFlags}")
 }