scons: Remove acados Include Paths from Global

[deanlee]

Removes the following global include paths from SCons and relocates them to the specific modules that require them:

• #third_party/acados/include
• #third_party/acados/include/blasfeo/include
• #third_party/acados/include/hpipm/include

This change improves build performance by reducing the number of directories the compiler searches globally.

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[adeebshihadeh]

Can you post before/after for these PRs? There's a tradeoff being made here on using the same environment everywhere (connivence) and time. If it's costing a lot of time, then I think these are worth it.

I propose we do one big PR with all the SCons optimizations, then evaluate whether it's worth it. If it is and the PR is too big, we can split it up then.

[deanlee]

I agree, it's not worth it for these small changes.