caravel_user_project_analog/verilog/dv/README.md : Undocumented implicit assumption GCC_PREFIX

[tatzelbrumm]

In
2. Local Installion (Linux)
Next, you will need to build the RV32I toolchain. Firstly, export the installation path for the RV32I toolchain,

export GCC_PATH=<gcc-installation-path>

Then, in

Local
You will need to export these environment variables:

export GCC_PATH=<gcc-installation-path>
export PDK_PATH=<pdk-location/sky130A>

Here, the developers make the implicit assumption that the user can guess that whatever
<gcc-installation-path> was before,
now <gcc-installation-path>/bin needs to be specified for the following to work.

cd <dv-test>
make