Fixed world breakage -- don't depend on <machine/soundcard.h> existing;

the symlink from <sys/soundcard.h> to <machine/soundcard.h> is worse
than useless since it doesn't exist in the SHARED=symlinks case.

usr.sbin/i4b/isdnphone/defs.h

@@ -49,13 +49,13 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/ioctl.h>
+#include <sys/soundcard.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/param.h>
 
 #include <machine/i4b_ioctl.h>
 #include <machine/i4b_tel_ioctl.h>
-#include <machine/soundcard.h>
 
 /* device file prefixes */