Get rid of {{{DB_PREV_DUP}}} from the 4.6 version of {{{db.h}}}. Addresses #1412.

git-svn-id: file:///svn/toku/tokudb@9109 c7de825b-a66e-492c-adef-691d508d4ae1

buildheader/db.h_4_6

@@ -89,7 +89,6 @@ typedef enum {
 #define DB_NEXT_DUP 17
 #define DB_NEXT_NODUP 18
 #define DB_PREV 23
-#define DB_PREV_DUP 24
 #define DB_PREV_NODUP 25
 #define DB_SET 26
 #define DB_SET_RANGE 27

buildheader/make_db_h.c

@@ -106,7 +106,8 @@ void print_defines (void) {
     dodefine(DB_NEXT_DUP);
     dodefine(DB_NEXT_NODUP);
     dodefine(DB_PREV);
-#ifdef DB_PREV_DUP
+#if 0 && defined(DB_PREV_DUP)
+    // DB_PREV_DUP isn't working in tdb, so don't use it.
     dodefine(DB_PREV_DUP);
 #endif
     dodefine(DB_PREV_NODUP);

include/db.h

@@ -89,7 +89,6 @@ typedef enum {
 #define DB_NEXT_DUP 17
 #define DB_NEXT_NODUP 18
 #define DB_PREV 23
-#define DB_PREV_DUP 24
 #define DB_PREV_NODUP 25
 #define DB_SET 26
 #define DB_SET_RANGE 27