Bug: 513735 - Remove exported internal API

While in the past Eclipse project had to export all packages, this
requirement has been removed ~6 months ago, so we do not need to export
everything.


Change-Id: Ic517e4dd64fe0a54ef7c4d22e9c40e439fe4301f
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/185558
Tested-by: Platform Bot <platform-bot@eclipse.org>
Tested-by: Andrey Loskutov <loskutov@gmx.de>
Reviewed-by: Andrey Loskutov <loskutov@gmx.de>