[Pkg-uml-pkgs] rootstrap is marked for autoremoval from testing

[Debian testing autoremoval watch]

rootstrap 0.3.25-1 is marked for autoremoval from testing on 2015-08-22

It (build-)depends on packages with these RC bugs:
778157: user-mode-linux: ftbfs with GCC-5
787979: user-mode-linux: FTBFS: build-dependency not installable: linux-source-3.16