This reverts commit a3e1047f.

It dramatically reduces the size of the installation to 250 MiB. We also
need to inject the rpath of the libraries during the build phase with
CMAKE_BUILD_RPATH as well as zlib. The CMAKE_BUILD_WITH_INSTALL_PATH
option is disabled, as it contradicts the former.

Fixes the problem where the triple used by newer versions of
config.guess don't match due to a change in x86 from
x86_64-unknown-linux-gnu to x86_64-pc-linux-gnu.