From: Pavel Sobolev <contact@paveloom.dev>
Subject: [PATCH] Use the `zstd_seekable.h` header from `externals`.

Upstream-PR: https://github.com/azahar-emu/azahar/pull/1305

Signed-off-by: Pavel Sobolev <contact@paveloom.dev>

--- a/src/common/zstd_compression.cpp
+++ b/src/common/zstd_compression.cpp
@@ -13,7 +13,7 @@
 #include <mutex>
 #include <sstream>
 #include <zstd.h>
-#include <zstd/contrib/seekable_format/zstd_seekable.h>
+#include <zstd_seekable.h>
 
 #include <boost/serialization/base_object.hpp>
 #include <boost/serialization/unique_ptr.hpp>