rebase -i: skip unnecessary picks using the rebase--helper

In particular on Windows, where shell scripts are even more expensive
than on MacOSX or Linux, it makes sense to move a loop that forks
Git at least once for every line in the todo list into a builtin.

Note: The original code did not try to skip unnecessary picks of root
commits but punts instead (probably --root was not considered common
enough of a use case to bother optimizing). We do the same, for now.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sequencer.h

@@ -50,6 +50,7 @@ int sequencer_make_script(int keep_empty, FILE *out,
 
 int transform_todo_ids(int shorten_ids);
 int check_todo_list(void);
+int skip_unnecessary_picks(void);
 
 extern const char sign_off_header[];