Merge branch 'openmpt-deprecated-fix' into 'master'

Fix OPENMPT deprecation error, openmpt_module_ctl_set

See merge request STJr/SRB2!990

src/sdl/mixer_sound.c

@@ -880,13 +880,18 @@ boolean I_SetSongSpeed(float speed)
 #ifdef HAVE_OPENMPT
 	if (openmpt_mhandle)
 	{
-		char modspd[13];
-
 		if (speed > 4.0f)
 			speed = 4.0f; // Limit this to 4x to prevent crashing, stupid fix but... ~SteelT 27/9/19
-
-		sprintf(modspd, "%g", speed);
-		openmpt_module_ctl_set(openmpt_mhandle, "play.tempo_factor", modspd);
+#if OPENMPT_API_VERSION_MAJOR < 1 && OPENMPT_API_VERSION_MINOR < 5
+		{
+			// deprecated in 0.5.0
+			char modspd[13];
+			sprintf(modspd, "%g", speed);
+			openmpt_module_ctl_set(openmpt_mhandle, "play.tempo_factor", modspd);
+		}
+#else
+		openmpt_module_ctl_set_floatingpoint(openmpt_mhandle, "play.tempo_factor", (double)speed);
+#endif
 		return true;
 	}
 #else