Merge branch 'ab/config-based-hooks-1'

Mostly preliminary clean-up in the hook API.

* ab/config-based-hooks-1:
  hook-list.h: add a generated list of hooks, like config-list.h
  hook.c users: use "hook_exists()" instead of "find_hook()"
  hook.c: add a hook_exists() wrapper and use it in bugreport.c
  hook.[ch]: move find_hook() from run-command.c to hook.c
  Makefile: remove an out-of-date comment
  Makefile: don't perform "mv $@+ $@" dance for $(GENERATED_H)
  Makefile: stop hardcoding {command,config}-list.h
  Makefile: mark "check" target as .PHONY

builtin/merge.c

@@ -13,6 +13,7 @@
 #include "builtin.h"
 #include "lockfile.h"
 #include "run-command.h"
+#include "hook.h"
 #include "diff.h"
 #include "diff-merges.h"
 #include "refs.h"
@@ -849,7 +850,7 @@ static void prepare_to_commit(struct commit_list *remoteheads)
 	 * and write it out as a tree.  We must do this before we invoke
 	 * the editor and after we invoke run_status above.
 	 */
-	if (find_hook("pre-merge-commit"))
+	if (hook_exists("pre-merge-commit"))
 		discard_cache();
 	read_cache_from(index_file);
 	strbuf_addbuf(&msg, &merge_msg);