[Bug 52915] Building vkd3d with custom VULKAN_LIBS no longer works

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52915

Zeb Figura  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
            Summary|Build vkd3d-git is broken   |Building vkd3d with custom
                   |(configure: error:          |VULKAN_LIBS no longer works
                   |libvulkan and libMoltenVK   |
                   |not found.)                 |
    Regression SHA1|                            |99a3adcc19f2a64fad630948851
                   |                            |616f52c00d553
           Keywords|                            |regression

--- Comment #4 from Zeb Figura  ---
Support for VULKAN_LIBS was intentionally removed in
https://source.winehq.org/git/vkd3d.git/commitdiff/99a3adcc19f2a64fad630948851616f52c00d553;
the intention is to use LDFLAGS instead, or alternatively replace e.g.
"VULKAN_LIBS=/path/to/wine64/dlls/vulkan-1/" with
"SONAME_LIBVULKAN=vulkan-1.dll".

We should probably restore VULKAN_LIBS, though to allow old build trees to
continue working. I'll send a patch.