[Bug]: OpenRV builds GC outside RV_DEPS_GC for GC artifacts that are properly copied to RV_DEPS_GC/install

### What happened?

1) Remove _build/lib, _build/share & _build/include : those are from GC. (optional in case 2) doesnt build: remove cmake/dependencies/RV_DEPS_GC-prefix)
2) rvcfg + rvbuildt RV_DEPS_GC
3) Notice that _build/lib, _build/share & _build/include are back and contain GC files

### List all the operating systems versions where this is happening

MacOS 13.2.1, Linux Rocky 8

### On what computer hardware is this happening?

MacPro laptop & Lenovo Thinkpad

### Relevant console log output

_No response_

### Environment variables

_No response_

### Extra information

I reproduced this bug on my Linux OS with the **main branch**.
To propose a fix, please test on all 3 platforms: Windows, Mac and Linux.

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Start by reproducing the reported sequence with rvcfg and rvbuildt RV_DEPS_GC after removing _build/lib, _build/share, and _build/include; inspect the RV_DEPS_GC configuration and cmake/dependencies/RV_DEPS_GC-prefix. Done means GC artifacts are copied only to RV_DEPS_GC/install and are not recreated in the top-level _build directories on Windows, macOS, and Linux.

Written by the indexing model from the issue text.