Fixing Mac build bustage.

modules/plugin/base/public/npapi.h

@@ -37,7 +37,7 @@
 
 
 /*
- *  npapi.h $Revision: 3.36 $
+ *  npapi.h $Revision: 3.37 $
  *  Netscape client plug-in API spec
  */
 
@@ -202,7 +202,7 @@ typedef short int16;
 #endif
 
 #ifndef _INT32
-#    if defined(__alpha) || defined(__amd64__) defined(__x86_64__)
+#    if defined(__alpha) || defined(__amd64__) || defined(__x86_64__)
 typedef int int32;
 #    else  /* __alpha */
 typedef long int32;