Backed out last change. It depends on the future change of adding

-I- to CFLAGS.  <sb.h> must currently be used to give the version
of sb.h in the current directory, while "sb.h" in the buggy version
gave the (wrong) version in the source directory.  Searching in the
source directory first is normal, but is the reverse of the order
suggested by the 4.4Lite2 #include style.  -I- will remove the
ambiguities.

sys/i386/isa/sound/local.h

@@ -57,7 +57,7 @@
 # define GUSMAX_MIXER
 #endif
 
-#include "sb.h"
+#include <sb.h>
 #if NSB == 0 && !defined(EXCLUDE_SB)
 #define EXCLUDE_SB
 #endif
@@ -72,7 +72,7 @@
 #define EXCLUDE_SB16MIDI
 #endif
 
-#include "pas.h"
+#include <pas.h>
 #if NPAS == 0 && !defined(EXCLUDE_PAS)
 #define EXCLUDE_PAS
 #endif