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"