parse-remote: remove this now-unused library

The previous two commits removed the last use of a function in this
library, but most of it had been dead code for a while[1][2]. Only the
"get_default_remote" function was still being used.

Even though we had a manual page for this library it was never
intended (or I expect, actually) used outside of git.git. Let's just
remove it, if anyone still cares about a function here they can pull
them into their own project[3].

1. Last use of error_on_missing_default_upstream():
   d03ebd4 ("rebase: remove the rebase.useBuiltin setting",
   2019-03-18)

2. Last use of get_remote_merge_branch(): 49eb8d3 ("Remove
   contrib/examples/*", 2018-03-25)

3. https://lore.kernel.org/git/[email protected]/

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

.gitignore

@@ -114,7 +114,6 @@
 /git-pack-redundant
 /git-pack-objects
 /git-pack-refs
-/git-parse-remote
 /git-patch-id
 /git-prune
 /git-prune-packed

Documentation/git-parse-remote.txt

@@ -613,7 +613,6 @@ SCRIPT_SH += git-submodule.sh
 SCRIPT_SH += git-web--browse.sh
 
 SCRIPT_LIB += git-mergetool--lib
-SCRIPT_LIB += git-parse-remote
 SCRIPT_LIB += git-rebase--preserve-merges
 SCRIPT_LIB += git-sh-i18n
 SCRIPT_LIB += git-sh-setup
@@ -2577,7 +2576,6 @@ XGETTEXT_FLAGS_PERL = $(XGETTEXT_FLAGS) --language=Perl \
 	--keyword=__ --keyword=N__ --keyword="__n:1,2"
 LOCALIZED_C = $(C_OBJ:o=c) $(LIB_H) $(GENERATED_H)
 LOCALIZED_SH = $(SCRIPT_SH)
-LOCALIZED_SH += git-parse-remote.sh
 LOCALIZED_SH += git-rebase--preserve-merges.sh
 LOCALIZED_SH += git-sh-setup.sh
 LOCALIZED_PERL = $(SCRIPT_PERL)

Makefile

@@ -135,7 +135,6 @@ git-p4                                  foreignscminterface
 git-pack-objects                        plumbingmanipulators
 git-pack-redundant                      plumbinginterrogators
 git-pack-refs                           ancillarymanipulators
-git-parse-remote                        synchelpers
 git-patch-id                            purehelpers
 git-prune                               ancillarymanipulators   complete
 git-prune-packed                        plumbingmanipulators

command-list.txt

@@ -20,7 +20,6 @@ USAGE="[--quiet] [--cached]
 OPTIONS_SPEC=
 SUBDIRECTORY_OK=Yes
 . git-sh-setup
-. git-parse-remote
 require_work_tree
 wt_prefix=$(git rev-parse --show-prefix)
 cd_to_toplevel