Merge branch 'jc/unused-symbols'

Mark file-local symbols as "static", and drop functions that nobody
uses.

* jc/unused-symbols:
  shallow.c: make check_shallow_file_for_update() static
  remote.c: make clear_cas_option() static
  urlmatch.c: make match_urls() static
  revision.c: make save_parents() and free_saved_parents() static
  line-log.c: make line_log_data_init() static
  pack-bitmap.c: make pack_bitmap_filename() static
  prompt.c: remove git_getpass() nobody uses
  http.c: make finish_active_slot() and handle_curl_result() static

diff --cc http.c
Simple merge

diff --cc pack-bitmap.c
Simple merge

diff --cc remote.c
Simple merge

diff --cc remote.h
Simple merge

diff --cc revision.c
Simple merge

diff --cc revision.h
Simple merge

diff --cc shallow.c
Simple merge