FindDevIL: Restore IL_FOUND result variable
The fix in commit d3f9f512 removed the previously-provided IL_FOUND
result variable. Set it for compatibility and update the documentation to mention the new variable.
Fixes: #16881 (closed)
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The fix in commit d3f9f512 removed the previously-provided IL_FOUND
result variable. Set it for compatibility and update the documentation to mention the new variable.
Fixes: #16881 (closed)