Include config.h in all .c files

Need to be the first file since it may define large files support
and other options.

src/extras/mdb-dump.c

@@ -1,4 +1,6 @@
 /* utility program to make a hex dump of a binary file (such as a mdb file) */
+
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>

src/extras/mdbsupport.c

@@ -1,5 +1,6 @@
 /* support routines for code generated by the util programs */
 
+#include "config.h"
 #include <stdio.h>
 #include <string.h>