YT-19210: expose YQL shared library for YT.

After this, a new target libyqlplugin.so appears. in open-source cmake build.
Diff in open-source YDB repo looks like the following: https://paste.yandex-team.ru/f302bdb4-7ef2-4362-91c7-6ca45f329264

1 files changed, 31 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/client/lock.h b/yt/cpp/mapreduce/client/lock.h
new file mode 100644
index 00000000000..7e2c7a127d4
--- /dev/null
+++ b/yt/cpp/mapreduce/client/lock.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "client.h"
+
+#include <yt/cpp/mapreduce/interface/client.h>
+
+namespace NYT {
+namespace NDetail {
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TLock
+    : public ILock
+{
+public:
+    TLock(const TLockId& lockId, TClientPtr client, bool waitable);
+
+    virtual const TLockId& GetId() const override;
+    virtual TNodeId GetLockedNodeId() const override;
+    virtual const ::NThreading::TFuture<void>& GetAcquiredFuture() const override;
+
+private:
+    const TLockId LockId_;
+    mutable TMaybe<::NThreading::TFuture<void>> Acquired_;
+    TClientPtr Client_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NDetail
+} // namespace NYT