tree-diff: do not assume we use only one pathspec

tree-diff: do not assume we use only one pathspec

The way tree-diff was set up assumed we would use only one set
of pathspec during the entire life of the program.  Move the
pathspec related static variables out to diff_options structure
so that we can filter commits with one set of paths while show
the actual diffs using different set of paths.

I suspect this breaks blame.c, and makes "git log paths..." to
default to the --full-diff, the latter of which is dealt with
the next commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>