hg: amber/amber: make j.l.i.FormatterBootstraps non public as it is not part of the API

[vicente.romero at oracle.com]

Changeset: 027ca9ecbcac
Author:    vromero
Date:      2019-02-05 13:53 -0500
URL:       http://hg.openjdk.java.net/amber/amber/rev/027ca9ecbcac

make j.l.i.FormatterBootstraps non public as it is not part of the API

! src/java.base/share/classes/java/lang/invoke/FormatterBootstraps.java