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Support for building VMF on FreeBSD and execution of basic fuzzing. - #3

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Support for building VMF on FreeBSD and execution of basic fuzzing.#3
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Adds support for being able to fuzz binaries on FreeBSD. Tested on x86-64 architecture along with ARM64 with FreeBSD 15.0 and 15.1. This uses the Linux code paths with some slight preprocessor commands to use a different code path where needed for compatibility with FreeBSD system calls and libraries.

This works with upstream AFL (most recently tested commit e33e7cd4f4b1da9cc76c19b7766deea790a2c5ee) with the FreeBSD support we recently got merged into that project. Use the standard Linux fuzzing modules in VMF for this.

This uses upstream AFL (most recently tested commit e33e7cd4f4b1da9cc76c19b7766deea790a2c5ee)
and the support is added to the Linux codepath in VMF.
Use the standard Linux fuzzing modules.
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