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CMakeLists.txt: fix warning with -Wdev

Even Rouault requested to merge rouault/libtiff:cmake_tiff_install_warning into master 
CMake Warning (dev) at CMakeLists.txt:62 (option):
  Policy CMP0077 is not set: option() honors normal variables.  Run "cmake
  --help-policy CMP0077" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  For compatibility with older versions of CMake, option is clearing the
  normal variable 'tiff-install'.
This warning is for project developers.  Use -Wno-dev to suppress it.

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