Merge branch 'ab/misc-cleanup'

Code clean-up.

* ab/misc-cleanup:
  alloc.[ch]: remove alloc_report() function
  object-store.h: remove unused has_sha1_file*()
  pack-bitmap-write: remove unused bitmap_reset() function
  xdiff/xmacros.h: remove unused XDL_PTRFREE
  configure.ac: remove USE_PIC comment
  run-command.h: remove always unused "clean_on_exit_handler_cbdata"

diff --cc configure.ac
Simple merge