Wine staging 5.15 release

[Alistair Leslie-Hughes]

Binary packages for various distributions will be available from:
https://www.winehq.org/download

Summary since last release
* Rebased to current wine 5.14 (670 patches are applied to wine vanilla)

NOTE: Currently the esync patchset has been disabled until it can be 
rebased.

Upstreamed (Either directly from staging or fixed with a similar patch).
* xactengine: IXACT3Engine Initialize return valid error code.
* fsutil: Add fsutil program with support for creating hard links.
* xactengine: Add support for xactengine3
* xactengine: Support older XACT3Engine interfaces
* xactengine: IXACT3Engine CreateSoundBank return correct HRESULT values.
* xactengine: unwrap structure based of it's type.
* xactengine: Dont cast interface pointers.
* xactengine: Correct callback to windows function.
* xactengine: Trace FAudio version being used
* ole32/tests: Add a bunch of tests for HGLOBAL based IStream::Clone.
* ole32: Allow moving a being reallocated block of memory managed by 
HGLOBAL based IStream.
* user32: Implement GetRegisteredRawInputDevices.
* dinput8/tests: Add DISCL_EXCLUSIVE / rawinput test.
* dinput8: Add support for rawinput based devices.
* dinput8: Use rawinput interface for mouse device.
* dinput8: Stop using LL hooks for mouse devices.

Added:
* [49650] winmm: Support relative paths when option media files
* [42027] systeminfo: Add basic functionality.
* [49692] mfplat: Improved support for multiple video formats.

Updated:
* programs-findstr

Where can you help
* Run Steam/Battle.net/GOG/UPlay/Epic
* Test your favorite game.
* Test your favorite applications.
* Improve staging patches and get them accepted upstream.

As always, if you find a bug, please report it via
https://bugs.winehq.org

Best Regards
  Alistair.