Get build working on Redhat 7.2 linux 2.4.7

Modules/ossaudiodev.c

@@ -1016,7 +1016,9 @@ initossaudiodev(void)
     _EXPORT_INT(m, SNDCTL_DSP_GETODELAY);
     _EXPORT_INT(m, SNDCTL_DSP_GETOPTR);
     _EXPORT_INT(m, SNDCTL_DSP_GETOSPACE);
+#ifdef SNDCTL_DSP_GETSPDIF
     _EXPORT_INT(m, SNDCTL_DSP_GETSPDIF);
+#endif
     _EXPORT_INT(m, SNDCTL_DSP_GETTRIGGER);
     _EXPORT_INT(m, SNDCTL_DSP_MAPINBUF);
     _EXPORT_INT(m, SNDCTL_DSP_MAPOUTBUF);
@@ -1028,7 +1030,9 @@ initossaudiodev(void)
     _EXPORT_INT(m, SNDCTL_DSP_SETDUPLEX);
     _EXPORT_INT(m, SNDCTL_DSP_SETFMT);
     _EXPORT_INT(m, SNDCTL_DSP_SETFRAGMENT);
+#ifdef SNDCTL_DSP_SETSPDIF
     _EXPORT_INT(m, SNDCTL_DSP_SETSPDIF);
+#endif
     _EXPORT_INT(m, SNDCTL_DSP_SETSYNCRO);
     _EXPORT_INT(m, SNDCTL_DSP_SETTRIGGER);
     _EXPORT_INT(m, SNDCTL_DSP_SPEED);