Got rid of unused externs.

receiver.c

@@ -36,12 +36,10 @@ extern int write_batch;
 extern int batch_gen_fd;
 extern int protocol_version;
 extern int relative_paths;
-extern int preserve_hard_links;
 extern int preserve_perms;
 extern int basis_dir_cnt;
 extern int make_backups;
 extern int cleanup_got_literal;
-extern int remove_source_files;
 extern int append_mode;
 extern int sparse_files;
 extern int keep_partial;
@@ -49,7 +47,6 @@ extern int checksum_seed;
 extern int inplace;
 extern int delay_updates;
 extern struct stats stats;
-extern char *stdout_format;
 extern char *tmpdir;
 extern char *partial_dir;
 extern char *basis_dir[];

rsync.c

@@ -51,7 +51,6 @@ extern int flist_eof;
 extern int keep_dirlinks;
 extern int make_backups;
 extern mode_t orig_umask;
-extern struct stats stats;
 extern struct file_list *cur_flist, *first_flist, *dir_flist;
 extern struct chmod_mode_struct *daemon_chmod_modes;
 

sender.c

@@ -44,7 +44,6 @@ extern int batch_fd;
 extern int write_batch;
 extern struct stats stats;
 extern struct file_list *cur_flist, *first_flist;
-extern char *stdout_format;
 
 /**
  * @file