[CMake] problems with tiff library dependencies

[Csaba Halász]

Hello cmakers,

TIFF library optionally depends on JPEG and ZLIB, but the FindTIFF
cmake module doesn't seem to handle that.
Unfortunately the dependencies may occur in any of the 4 combinations
(none, jpeg only, zlib only, or both)
See the section titled "Configuring Optional Packages/Support" at
http://www.remotesensing.org/libtiff/build.html.

I have come up with a solution, probably not the best way but good for a start.
Be kind, this my first-ever attempt at a cmake module ;)

-- 
Csaba
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