Remove references to dmalloc

There are more modern tools for memory debugging, get rid of DMALLOC
crap in the source code.

I've left one reference in backend.c to prevent a merge conflict but
this can be removed later.

src/util/mdb-array.c

@@ -21,10 +21,6 @@
 
 #include "mdbtools.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 int
 main (int argc, char **argv)
 {

src/util/mdb-export.c

@@ -18,10 +18,6 @@
 
 #include "mdbtools.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 #undef MDB_BIND_SIZE
 #define MDB_BIND_SIZE 200000
 

src/util/mdb-header.c

@@ -22,10 +22,6 @@
 #include <string.h>
 #include "mdbtools.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 void copy_header (FILE *f)
 {
  fprintf (f, "/******************************************************************/\n");

src/util/mdb-parsecsv.c

@@ -24,10 +24,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 #define FILENAMESIZE 128
 #define BUFFERSIZE 4096
 #define LF 10

src/util/mdb-schema.c

@@ -19,10 +19,6 @@
 /* this utility dumps the schema for an existing database */
 #include "mdbtools.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 int
 main (int argc, char **argv)
 {

src/util/mdb-sql.c

@@ -47,10 +47,6 @@ extern void clear_history ();
 #include <string.h>
 #include "mdbsql.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 void dump_results(FILE *out, MdbSQL *sql, char *delimiter);
 void dump_results_pp(FILE *out, MdbSQL *sql);
 

src/util/mdb-tables.c

@@ -20,10 +20,6 @@
 
 #include "mdbtools.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 struct type_struct {
 	char *name;
 	int value;

src/util/mdb-ver.c

@@ -21,10 +21,6 @@
 #include "mdbver.h"
 #include "mdbprivate.h"
 
-#ifdef DMALLOC
-#include "dmalloc.h"
-#endif
-
 int
 main(int argc, char **argv)
 {