Drop old CMake "build settings" export/import
The CMakeExportBuildSettings and CMakeImportBuildSettings modules used to export compiler paths and flags from one project and import them into another. The import process would force the settings on the including project. Forcing settings helped long ago when compiler ABIs changed frequently but is now just a nuisance. We've deemed the behavior harmful so this commit simply removes it. The modules and macros now error out if included or called from a project that requires CMake 2.8 or higher.
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