Fix 11 Gitea issues (#29, #30, #31, #35, #38, #41, #42, #43, #44, #45, #46)

#29 - compression_level now used in data_compress()
#30 - chunk_size no longer truncated to 32-bit
#31 - chmod/chown failures now logged
#35 - strtok -> strtok_r for thread safety
#38 - open_next_directory returns -1 on opendir failure
#41 - file_send_sendfile uses compression_level param
#42 - dirname() uses copy to avoid modifying input
#43 - delete_extras_walk checks manifest before rmdir
#44 - server_host/port moved into Config struct
#45 - SSH parse_remote_dest uses dynamic allocation
#46 - send_chunk refactored, reduced nesting/duplication

src/client/client_send.h

@@ -5,9 +5,6 @@
 #include "config.h"
 #include "transport_tcp.h"
 
-extern char* server_host;
-extern int server_port;
-
 int send_chunk(Client* client, Chunk* chunk, Config* config);
 int send_files(Config* config);
 int send_files_multithreaded(Config* config);