And setting it to `0`, no longer requiring defining it everywhere except in foreground executables as needed.
_Also_:
* Require `GLib` >= `v2.50`
* Needed for [g_log_writer_standard_streams](https://docs.gtk.org/glib/func.log_writer_standard_streams.html)
* Set FreeBSD job `BUILD_PARALLEL_LEVEL` & `TEST_PARALLEL_LEVEL` environment variables via `run`
* Rather than hard-coding them
* `includes/config.h.in`
* Wrap contents in `#ifndef CONFIG_H`
* `includes/mod_tile.h`
* Include `protocol.h`
* For `XMLCONFIG_MAX`
* Include `apr_tables.h`
* For `apr_array_header_t`/`apr_time_t`/`apr_uint64_t`
* Include `netinet/in.h`
* For `in6_addr`/`in_addr_t`
* `src/cache_expire.c`
* Include `netinet/in.h`
* For `htonl`/`htons`
* `src/gen_tile.cpp`
* Use `snprintf` instead of `sprintf`
* To resolve `warning: 'sprintf' is deprecated` in [`macOS` builds](https://github.com/openstreetmap/mod_tile/actions/runs/7590268635/job/20677236621#step:5:579)
* `src/gen_tile_test.cpp`
* Use `snprintf` instead of `sprintf`
* To resolve `warning: 'sprintf' is deprecated` in [`macOS` builds](https://github.com/openstreetmap/mod_tile/actions/runs/7590268635/job/20677236621#step:5:579)
* `src/mod_tile.c`
* Use `snprintf` instead of `sprintf`
* To resolve `warning: 'sprintf' is deprecated` in [`macOS` builds](https://github.com/openstreetmap/mod_tile/actions/runs/7590268635/job/20677236621#step:5:579)
* Cast `os_thread` to `(unsigned long)` in `ap_log_rerror` calls format
* To resolve `warning: format specifies type 'long' but the argument has type 'apr_os_thread_t'`
* `os_thread` is an alias of `unsigned long`
* Use `"%" APR_OFF_T_FMT`/`APR_UINT64_T_FMT "..."` to resolve warnings under `macOS`
* To resolve `warning: format specifies type 'long' but the argument has type 'off_t'`
* The format/type for `apr_off_t` varies under `macOS`
* See [here](8e68a77f61/include/apr.h.in (L610-L645))
* And resolve `warning: format specifies type 'long' but the argument has type 'apr_uint64_t'`
* The format/type for `apr_uint64_t` varies under `macOS`
* See [here](8e68a77f61/include/apr.h.in (L610-L645))
* Divide by `2.0` rather than `2`
* To resolve `possible loss of precision` warning
* Use `%li` rather than `"%" APR_TIME_T_FMT` as format for `maxAge`
* It is defined as a `long int`
* `src/render_submit_queue.c`
* Include `string.h`/`strings.h`
* To resolve `warning: call to undeclared library function 'bzero'`
* To resolve `warning: call to undeclared library function 'strncpy'`
* To resolve `warning: call to undeclared library function 'strdup'`
* To resolve `warning: call to undeclared library function 'strerror'`
* To resolve `warning: call to undeclared library function 'strchr'`
* To resolve `warning: call to undeclared library function 'strlen'`
* To resolve `warning: call to undeclared library function 'memset'`
* Cast `performance_stats.stat[i].noRendered` to `(float)`
* To resolve `possible loss of precision` warning
* `src/renderd.c`
* Use `snprintf` instead of `sprintf`
* To resolve `warning: 'sprintf' is deprecated` in [`macOS` builds](https://github.com/openstreetmap/mod_tile/actions/runs/7590268635/job/20677236621#step:5:579)
* Change `const char` to `char` for `ini_fileExtension`, `ini_mimeType`, `ini_outputFormat`
* To resolve `warning: format specifies type 'char *' but the argument has type 'const char *'`
* `src/request_queue.c`
* Add `default case` to `switch` statements
* To resolve:
* `warning: enumeration values 'queueRender' and 'queueDuplicate' not handled in switch`
* `warning: enumeration values 'cmdIgnore', 'cmdDone', and 'cmdNotDone' not handled in switch`
* `src/store_file.c`
* Cast `pthread_self()` to `(unsigned long)`
* To resolve `warning: format specifies type 'unsigned long' but the argument has type 'pthread_t'`
* No longer need `CFLAGS=-Wno-implicit-function-declaration`
* Using [`GLib Logging Framework`](https://developer.gnome.org/programming-guidelines/stable/logging.html.en) for logging
* Created new `g_logger` function for logging
* Outputs to `stdout`/`stderr` only when running in `foreground`
* `stderr` for `message`, `warning`, `critical` & `error` levels
* `stdout` for `debug` & `info` levels
* Use `G_MESSAGES_DEBUG=all` environment to enable `debug` to print
* Otherwise, output will be to `syslog` or `systemd journal` (when appropriate)
* Standardized usage of `{LOG_PRIORITY}: ` prefix in log messages
* Only when using `syslog`, otherwise `GLib Logging` will take care of it
* Changed `fprintf(stderr`, `printf` & `perror` calls to `g_logger` calls
* You might want to check them out closely to make sure I chose the right levels
* No changes to `logging/output` were made to "`foreground`" programs (I.E. `render_*`)
* Changed `0`,`1` to `no_argument`,`required_argument` in `getopt_long`'s `long_options`
* Fixed `renderd`'s `foreground` opt (should be `no_argument` [0] rather than `reguired_argument` [1])
* Basic test for `mod_tile` module
* ~~Extended `renderd` log priority onto Mapnik's logger~~
