ox-ruby: fix build (#14206)

Avoids the `ruzzy` logic at the base runner since it's not available on
the bots. However, we can just put the ruzzy gem as part of the gems in
the target fuzzing library.

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

projects/ox-ruby/build.sh

@@ -24,11 +24,15 @@ cd $SRC/ox-ruby
 gem build
 RUZZY_DEBUG=1 gem install --development --verbose *.gem
 
+# Sync gems folder with ruzzy
+rsync -avu /install/ruzzy/* $OUT/fuzz_parse-gem
+
 #for fuzz_target_path in $SRC/harnesses/fuzz_*.rb; do
 #	ruzzy-build "$fuzz_target_path"
 #done
 
 cp $SRC/harnesses/fuzz_parse.rb $OUT/
+export GEM_PATH=$OUT/fuzz_parse-gem
 
 echo """#!/usr/bin/env bash
 # LLVMFuzzerTestOneInput for fuzzer detection.
@@ -37,6 +41,7 @@ this_dir=\$(dirname \"\$0\")
 echo "GEM_HOME FIRST: \$GEM_HOME"
 
 export GEM_HOME=\$this_dir/fuzz_parse-gem
+export GEM_PATH=\$this_dir/fuzz_parse-gem
 echo "GEM_PATH: \$GEM_PATH"
 echo "GEM_HOME: \$GEM_HOME"
 echo "Showing gem home:"
@@ -45,8 +50,7 @@ ls -la \$GEM_HOME
 echo "Showing this dir:"
 ls -la \$this_dir
 
-
-/usr/local/bin/ruzzy \$this_dir/fuzz_parse.rb \$@""" > $OUT/fuzz_parse
+ASAN_OPTIONS="allocator_may_return_null=1:detect_leaks=0:use_sigaltstack=0" LD_PRELOAD=\$(ruby -e 'require \"ruzzy\"; print Ruzzy::ASAN_PATH') ruby \$this_dir/fuzz_parse.rb \$@""" > $OUT/fuzz_parse
 
 chmod +x $OUT/fuzz_parse