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ROP: Remove stdout and argv workaround in ROPgadget invocation (#2639)

* ROP: Remove stdout and argv workaround in ROPgadget invocation

ROPgadget supports usage as a library since v5.3 in 2015.
The hacks are no longer needed.

This also fixes running multiple exploits in parallel in the same process. They could race and output was lost.

* Update CHANGELOG

* Fix race while creating rop-cache folder

There was a TOCTOU when two ROP classes were interleaved just wrong in a multi-threaded script.

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