freelist_realloc(): add header files for missing declarations

src/freelist/realloc.c

@@ -24,6 +24,9 @@
 
 #include "dmmlib/freelist/freelist.h"
 #include "dmmlib/freelist/block_header.h"
+#include "freelist/block_header_funcs.h"
+
+#include "dmmlib/dmmlib.h"
 
 #include "memcpy.h"