Fix test instructions

[jonesmz]

Another change I could make a PR for is to modify

make -j$(nproc)

to

cmake --build . --parallel $(nproc) --verbose --clean-first

Which is a more idomatic way to build cmake projects.

[jonesmz]

Do you want me to add another commit to change it to cmake --build . --parallel $(nproc) --verbose --clean-first ?

Or would you rather leave it as make ?

[thed636]

@jonesmz would it be nice to add it as a separate recommendation to simplify and speed up the process?

[jonesmz]

The reason someone might want "cmake --build ." is because they won't need to know anything about the generator that cmake defaulted to on the current platform.

Theres:

• Make
• MSBuild
• Ninja

and others

[thed636]

Yes, that’s a good reason, let’s add it instead of make.

[jonesmz]

Just to confirm you're looking to have me make a PR that adds cmake --build . --parallel $(nproc) --verbose --clean-first to the instructions?

[thed636]

Yes, sure. I just merged this PR, since it was approved.