Editable build in strict mode (#187) prevents git updates and breaks angr management plugins

[ltfish]

Description

#187 installs angr management (and other angr libraries) in strict mode for editable build, which leads to two problems:

• git pull each repo no longer updates the installed libraries because each installed dependency package is copied to .build directories (e.g., you'll see angr exist under angr-management/.build/angr, and it's the version that's used by the installed angr management).
• angr management can no longer list default installed plugins.

Any of the following solutions will work for me:

• Switch back to the non-strict mode of editable build.
• Make strict mode optional in extremely-simple-setup.sh.
• Fix these problems in strict mode.

Steps to reproduce the bug

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Environment

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Additional context

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