Fixed CVE-2022-2585 exploit code

[blincoln-bf]

The exploit code for CVE-2022-2585 shared by SSD Secure Disclosure was corrupted (on their original page at https://ssd-disclosure.com/ssd-advisory-linux-clock_thread_cputime_id-lpe/):

• \n newline characters in C strings had been converted to the letter n. This broke at least one key function, and also caused console output to be formatted poorly.
• If a file began with a # (e.g. # define), that first pound sign was stripped, which prevented compilation because it broke two #define statements.

The version in this repo was also missing the customized libexp.c included in the SSD Secure Disclosure post. That file is necessary because it contains quite a few functions referred to in exploit.c.

Finally, I added instructions for compiling the exploit, because it's not just make or gcc -o exploit exploit.c in this case.