Require CMake 2.8.2 or higher to build CMake
Update the requirement specified in the top-level CMakeLists.txt file. Drop the special-case minimum required version of 2.8.0 because the new minimum subsumes it. Revert commit 6c611c6b (libarchive: Restore CMake 2.6.3 as minimum version, 2012-01-05) since our requirement now subsumes libarchive's.
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