move it to libc

[todo]

droidboot_generic_uefi/Library/lwext4/src/ext4_dir.c

Lines 57 to 62 in 7f46bd0

	// HACK: declare memcmp here, TODO: move it to libc
	static int memcmp(const void *s1, const void *s2, UINTN n)
	{
	const unsigned char *c1 = s1, *c2 = s2;
	int d = 0;

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This issue was generated by todo based on a TODO comment in 7f46bd0. It's been assigned to @luka177 because they committed the code.