Code cleanup (#393)

* Code cleanup using deheader for removing unnused headers and adding others to be portable. Removed unused files and renamed .cpp files that are only used as #includes in others

* add missing files

src/fsdb.cpp

@@ -7,20 +7,16 @@
   * Copyright 1999 Bernd Schmidt
   */
 
-#include "sysconfig.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
 #include "sysdeps.h"
 
 #include "options.h"
-#include "uae.h"
-#include "traps.h"
 #include "memory.h"
-#include "custom.h"
-#include "newcpu.h"
-#include "filesys.h"
-#include "autoconf.h"
-#include "fsusage.h"
 #include "fsdb.h"
-#include "uae/io.h"
 
 /* The on-disk format is as follows:
  * Offset 0, 1 byte, valid