CMAKE_INSTALL_LIBDIR documentation is incorrect

The docs (https://cmake.org/cmake/help/v3.15/module/GNUInstallDirs.html) say:

  LIBDIR
    object code libraries (lib or lib64 or lib/<multiarch-tuple> on Debian)

does not match reality on debian:latest, where CMAKE_INSTALL_LIBDIR is set to lib (cmake 3.7, but see below)

nor does it match the code comments: https://gitlab.kitware.com/cmake/cmake/blob/18365587c86396f988e256b5acf4d2312f3be2bb/Modules/GNUInstallDirs.cmake#L210-212

# For Debian with multiarch, use 'lib/${CMAKE_LIBRARY_ARCHITECTURE}' if
  # CMAKE_LIBRARY_ARCHITECTURE is set (which contains e.g. "i386-linux-gnu"
  # and CMAKE_INSTALL_PREFIX is "/usr"

Edited Sep 12, 2019 by Brad King

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