Install location requires sudo

### Brief Issue Summary

I would like to install my project to `/usr/local` using the `install` CMake target. On my (Mac) system this requires `sudo` permissions. Instead of asking for permissions, CMake Tools simply fails. I can run `sudo ninja install` from the command-line. However, if CMake has to build a binary during this step, it will be written with the owner set to `root`. Then, if I make another target within CMake Tools, e.g. `all`, it will fail because it cannot overwrite the file.

### Expected:

Somehow CMake Tools asks for my password so that I can install to `/usr/local`.

### Other Notes/Information

I admit this may be a difficult problem to solve well. The reason I would like to install to `/usr/local` is that I use BATS as my test framework, and since Apple added System Integrity Protection (SIP) to Mac OS X, child processes no longer receive the `DYLD_LIBRARY_PATH` variable in their environment. This means my BATS tests cannot find my shared libraries, unless they are installed to a system path such as `/usr/local` 😡

If anyone has a better suggestion as a workaround, I am all ears.

Start by tracing how CMake Tools invokes the `install` target and compare it with the reported `sudo ninja install` behavior on macOS. Consider the ownership problem for binaries built during installation and the `/usr/local` permission prompt; done means installation can handle the required permissions without leaving subsequent CMake builds unable to overwrite files.

Written by the indexing model from the issue text.