Add CLOCK_MONOTONIC_RAW as second audio log clock

I've had to correct part of the sound effects during editing because
they were logged to have happened like 0-2 seconds late, I didn't know
you could also choose a different clock. Let's choose the "raw hard-
ware-based time that is not subject to NTP adjustments or the
incremental adjustments performed by adjtime(3)."

See clock_gettime(2)

desktop_version/src/Music.cpp

@@ -35,8 +35,13 @@ musicclass::musicclass(void)
 
 void musicclass::audio_log_set_timestamp(void)
 {
-    clock_gettime(CLOCK_REALTIME, &audio_log_t);
-    sprintf(audio_log_timestring_lol, "%lu.%lu", audio_log_t.tv_sec, audio_log_t.tv_nsec);
+    clock_gettime(CLOCK_REALTIME, &audio_log_t_realtime);
+    clock_gettime(CLOCK_MONOTONIC_RAW, &audio_log_t_monotonic);
+
+    sprintf(audio_log_timestring_lol, "%lu.%lu;%lu.%lu",
+		audio_log_t_realtime.tv_sec, audio_log_t_realtime.tv_nsec,
+		audio_log_t_monotonic.tv_sec, audio_log_t_monotonic.tv_nsec
+	);
 }
 
 void musicclass::start_audio_log(void)

desktop_version/src/Music.h

@@ -80,7 +80,8 @@ class musicclass
     int num_mmmmmm_tracks;
 
     // Audio log
-    struct timespec audio_log_t;
+    struct timespec audio_log_t_realtime;
+    struct timespec audio_log_t_monotonic;
     char audio_log_timestring_lol[100];
 
     bool audio_log_started;