Merge branch 'stable-6.4' into stable-6.5

* stable-6.4:
  GC: Close File.lines stream

Change-Id: I7e3a4b3671e779fd62062c4e10d224f432e39b54

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
Simple merge