file_sys: Add support for BPS patches

The BPS format allows distributing patches that are smaller and that do
not contain copyrighted content if data is relocated
(unlike non-trivial IPS patches).

This is essential for games such as MM3D that have three barely
different code revisions. Supporting all three versions would
demand an unreasonable amount of work; with BPS patches only one
version has to be supported.

src/core/file_sys/patch.h

@@ -12,4 +12,6 @@ namespace FileSys::Patch {
 
 bool ApplyIpsPatch(const std::vector<u8>& patch, std::vector<u8>& buffer);
 
+bool ApplyBpsPatch(const std::vector<u8>& patch, std::vector<u8>& buffer);
+
 } // namespace FileSys::Patch