[CMake] Why dont FindTIFF.cmake and FindJPEG.cmake consider <pkg>_DIR variables?

[Kent Williams]

Are FindTIFF.cmake and FindJPEG.cmake really old and neglected?

Neither seems to bother looking at TIFF_DIR or JPEG_DIR -- you have to  set
TIFF_LIBRARY and TIFF_INCLUDE_DIR (or JPEG_LIBRARY and JPEG_INCLUDE_DIR).

find_package is a great facility but I find myself having to look at the
actual Find<Package>.cmake file when I incorporate a new package to see
what its actual requirements are.
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