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FindDevIL: Restore IL_FOUND result variable
The fix in commit v3.8.0-rc1~257^2~1 (FindDevIL: fail properly when library is not found, 2016-11-24) removed the previously-provided `IL_FOUND` result variable. Set it for compatibility and update the documentation to mention the new variable. Fixes: #16881
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@@ -25,7 +25,7 @@
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# library interfaces with OpenGL. It is not strictly needed
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# in applications.
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# IL_INCLUDE_DIR - where to find the il.h, ilu.h and ilut.h files.
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# IL_FOUND - this is set to TRUE if all the above variables were set.
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# DevIL_FOUND - this is set to TRUE if all the above variables were set.
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# This will be set to false if ILU or ILUT are not found,
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# even if they are not needed. In most systems, if one
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# library is found all the others are as well. That's the
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@@ -70,3 +70,5 @@ find_library(ILU_LIBRARIES
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(DevIL DEFAULT_MSG
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IL_LIBRARIES ILU_LIBRARIES
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IL_INCLUDE_DIR)
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# provide legacy variable for compatiblity
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set(IL_FOUND ${DevIL_FOUND})
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