[SKIP SOF-TEST] scripts/fuzz.sh: add a -p "pristine" flag that deletes build-fuzz/

[marc-hb]

It's slower but safer when changing some parameters.

[marc-hb]

@lrudyX , @wszypelt the failure in https://sof-ci.01.org/sof-pr-viewer/#/build/PR8831/build13511184 is new, never seen that one before. Some system is down?

14:34:15,148 INFO  - D:\qba2\workspace\44988>robocopy pull-8831-merge_1956549\INSTALL\ \\10.x.x.x\Builds\pull-8831-merge_1956549\ *.ri *.ldc /E
14:34:15,162 INFO  -
14:34:15,162 INFO  - -------------------------------------------------------------------------------
14:34:15,163 INFO  - ROBOCOPY :: Robust File Copy for Windows
14:34:15,163 INFO  - -------------------------------------------------------------------------------
14:34:15,163 INFO  -
14:34:37,178 INFO  - Started : Friday, February 2, 2024 11:34:15 PM
14:34:37,179 INFO  - 2024/02/02 23:34:37 ERROR 53 (0x00000035) Getting File System Type of Destination \\10.x.x.x\Builds\pull-8831-merge_1956549\
14:34:37,179 INFO  - The network path was not found.

In any case this is totally unrelated to this PR.

[lgirdwood]

@wszypelt @lrudyX good to merge ?

[marc-hb]

QB can't possibly be using that script.

This being said, I would like a review from @andyross

[wszypelt]

@lgirdwood Internal Intel CI Build and tests are ok