Made the memory backend, should somewhat work

platform/file.c

@@ -18,6 +18,20 @@
 #define __miniffs_internal
 #include <miniffs.h>
 
+/* Exported API */
+miniffs_t *miniffs_openfs(char *host_file)
+{
+    return NULL;
+}
+
+
+/* Some internal functions */
+void *miniffs_getfileaddr(miniffs_t *fs, fileentry_t *fent)
+{
+
+}
+
+
 size_t host_map_file(char *filename, char **dest)
 {
     char *ret_ptr;