revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/revision.h

@@ -9,19 +9,6 @@
 #include "diff.h"
 #include "commit-slab-decl.h"
 
-/**
- * The revision walking API offers functions to build a list of revisions
- * and then iterate over that list.
- *
- * Calling sequence
- * ----------------
- *
- * The walking API has a given calling sequence: first you need to initialize
- * a rev_info structure, then add revisions to control what kind of revision
- * list do you want to get, finally you can iterate over the revision list.
- *
- */
-
 /* Remember to update object flag allocation in object.h */
 #define SEEN		(1u<<0)
 #define UNINTERESTING   (1u<<1)
@@ -190,10 +177,10 @@ struct rev_info {
 			always_show_header:1;
 
 	/* Format info */
-	int		show_notes;
 	unsigned int	shown_one:1,
 			shown_dashes:1,
 			show_merge:1,
+			show_notes:1,
 			show_notes_given:1,
 			show_signature:1,
 			pretty_given:1,
@@ -319,29 +306,11 @@ struct setup_revision_opt {
 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 #define init_revisions(revs, prefix) repo_init_revisions(the_repository, revs, prefix)
 #endif
-
-/**
- * Initialize a rev_info structure with default values. The third parameter may
- * be NULL or can be prefix path, and then the `.prefix` variable will be set
- * to it. This is typically the first function you want to call when you want
- * to deal with a revision list. After calling this function, you are free to
- * customize options, like set `.ignore_merges` to 0 if you don't want to
- * ignore merges, and so on.
- */
 void repo_init_revisions(struct repository *r,
 			 struct rev_info *revs,
 			 const char *prefix);
-
-/**
- * Parse revision information, filling in the `rev_info` structure, and
- * removing the used arguments from the argument list. Returns the number
- * of arguments left that weren't recognized, which are also moved to the
- * head of the argument list. The last parameter is used in case no
- * parameter given by the first two arguments.
- */
 int setup_revisions(int argc, const char **argv, struct rev_info *revs,
 		    struct setup_revision_opt *);
-
 void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
 			const struct option *options,
 			const char * const usagestr[]);
@@ -350,28 +319,11 @@ void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
 int handle_revision_arg(const char *arg, struct rev_info *revs,
 			int flags, unsigned revarg_opt);
 
-/**
- * Reset the flags used by the revision walking api. You can use this to do
- * multiple sequential revision walks.
- */
 void reset_revision_walk(void);
-
-/**
- * Prepares the rev_info structure for a walk. You should check if it returns
- * any error (non-zero return code) and if it does not, you can start using
- * get_revision() to do the iteration.
- */
 int prepare_revision_walk(struct rev_info *revs);
-
-/**
- * Takes a pointer to a `rev_info` structure and iterates over it, returning a
- * `struct commit *` each time you call it. The end of the revision list is
- * indicated by returning a NULL pointer.
- */
 struct commit *get_revision(struct rev_info *revs);
-
-const char *get_revision_mark(const struct rev_info *revs,
-			      const struct commit *commit);
+char *get_revision_mark(const struct rev_info *revs,
+			const struct commit *commit);
 void put_revision_mark(const struct rev_info *revs,
 		       const struct commit *commit);
 
@@ -381,19 +333,8 @@ void mark_trees_uninteresting_sparse(struct repository *r, struct oidset *trees)
 
 void show_object_with_name(FILE *, struct object *, const char *);
 
-/**
- * This function can be used if you want to add commit objects as revision
- * information. You can use the `UNINTERESTING` object flag to indicate if
- * you want to include or exclude the given commit (and commits reachable
- * from the given commit) from the revision list.
- *
- * NOTE: If you have the commits as a string list then you probably want to
- * use setup_revisions(), instead of parsing each string and using this
- * function.
- */
 void add_pending_object(struct rev_info *revs,
 			struct object *obj, const char *name);
-
 void add_pending_oid(struct rev_info *revs,
 		     const char *name, const struct object_id *oid,
 		     unsigned int flags);