Update build docs for static links

[adammoody]

In our docs: https://scr.readthedocs.io/en/v3.0rc1/users/integration.html#building-with-the-scr-library

It would be helpful to list other library dependencies needed for a static link with libscr.a, including:

• -lpthread -lz,
• -lyogrt when libyogrt is enabled,
• -lbbAPI when BBAPI is enabled,
• -lmysqlclient when MySQL is enabled.

[adammoody]

@mcfadden8 , I've got this issue open so we can track the set of libs we need. Please feel free to add any that you find to be missing.

[mcfadden8]

So far, I have not noticed any libraries beyond what is listed above.

@adammoody, one question that came up was how to make sure that "MPI is enabled". Does SCR even build/run without MPI?