Bug 1962321 - Revert removing out/ directory after ossfuzz build, r=djackson

This didn't fix the fuzz introspector issue and instead seems to have caused oss-fuzz to write a workaround for caching: google/oss-fuzz#13492.

Differential Revision: https://phabricator.services.mozilla.com/D264573

--HG--
extra : moz-landing-system : lando

Author: moz-mdauer

automation/ossfuzz/build.sh

@@ -66,9 +66,3 @@ for name in "${!tls_targets[@]}"; do
         copy_fuzzer nssfuzz-$name $name
     fi
 done
-
-# Fuzz introspector picks up files in the out/Debug directory as fuzz
-# targets, messing up the generated reports.
-# To avoid this, we clear the build directory at the end. NSS libraries
-# are statically linked to the fuzz targets.
-rm -rf out/