fix(MDC): revert f1shy's MDC changes and renames

AltStore/MDC/vm_unaligned_copy_switch_race.h

@@ -0,0 +1,10 @@
+#ifdef MDC
+#pragma once
+#include <stdlib.h>
+#include <stdbool.h>
+/// Uses CVE-2022-46689 to overwrite `overwrite_length` bytes of `file_to_overwrite` with `overwrite_data`, starting from `file_offset`.
+/// `file_to_overwrite` should be a file descriptor opened with O_RDONLY.
+/// `overwrite_length` must be less than or equal to `PAGE_SIZE`.
+/// Returns `true` if the overwrite succeeded, and `false` if the device is not vulnerable.
+bool unaligned_copy_switch_race(int file_to_overwrite, off_t file_offset, const void* overwrite_data, size_t overwrite_length);
+#endif /* MDC */