Merge branch 'jc/ll-merge-expose-path'

Traditionally, external low-level 3-way merge drivers are expected to produce their results based solely on the contents of the three variants given in temporary files named by %O, %A and %B on their command line. Additionally allow them to look at the final path (given by %P). * jc/ll-merge-expose-path: ll-merge: pass the original path to external drivers