Merge branch 'pk/rebase-in-c-6-final'

The final step of rewriting "rebase -i" in C.

* pk/rebase-in-c-6-final:
rebase: default to using the builtin rebase

diff --combined builtin/rebase.c
index 789d8698425b2faed583e3a446ac7d082252d282,9dc8475cd361af2ad712f4f53df3453df5f9bd45..f1355efee7a023b0080c4b952c7206f4db14b0c9
--- 1/builtin/rebase.c
--- 2/builtin/rebase.c
+++ b/builtin/rebase.c
@@@ -21,7 -21,6 +21,7 @@@
  #include "diff.h"
  #include "wt-status.h"
  #include "revision.h"
 +#include "commit-reach.h"
  #include "rerere.h"
  
  static char const * const builtin_rebase_usage[] = {
@@@ -55,7 -54,7 +55,7 @@@ static int use_builtin_rebase(void
        cp.git_cmd = 1;
        if (capture_command(&cp, &out, 6)) {
                strbuf_release(&out);
-               return 0;
+               return 1;
        }
  
        strbuf_trim(&out);