cmake: use single output

Fixes #15184. Install everything, including documentation, into one
output, increasing package size by 10%. Otherwise, the help commands for
CMake do not work. This is a good trade because CMake should be a
build-only dependency. The only reason the docs should ever make it to
runtime is if the user has actually installed CMake, in which case
there's a pretty good chance they want the docs, too.

0 files changed, 0 insertions, 0 deletions