change DL_OPEN to HAVE_LIBDL

pd/src/configure.in

@@ -208,7 +208,7 @@ dnl This should be fixed so Pd can use ALSA shared libraries where appropriate.
       LDFLAGS="$LDFLAGS -static"
     fi 
     EXT=pd_linux
-    CPPFLAGS="-DDL_OPEN -DPA_USE_OSS -DUNIX -DUNISTD -fno-strict-aliasing"
+    CPPFLAGS="-DHAVE_LIBDL -DPA_USE_OSS -DUNIX -DUNISTD -fno-strict-aliasing"
 dnl No OSS on hurd
     if test `uname -s` = "GNU";
     then

pd/src/s_loader.c

@@ -2,7 +2,7 @@
 * For information on usage and redistribution, and for a DISCLAIMER OF ALL
 * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
 
-#ifdef DL_OPEN
+#ifdef HAVE_LIBDL
 #include <dlfcn.h>
 #endif
 #ifdef UNISTD
@@ -173,7 +173,7 @@ gotone:
     strncat(filename, nameptr, FILENAME_MAX-strlen(filename));
     filename[FILENAME_MAX-1] = 0;
 
-#ifdef DL_OPEN
+#ifdef HAVE_LIBDL
     dlobj = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
     if (!dlobj)
     {