adding fuzzer for espeak_synth (#1178)

* Add: fuzzer files and modifications in config & compil
* add configure.ac change
* add minimize-corpus.sh
* add fuzzing directory and readme
* add to check if CC support libfuzzer
* Make workflow dump the crash POC
* Add debugging information
* Run fuzzing only once a week for now

Co-authored-by: kmamadoudram <kalilou.mamadou-drame@etu.u-bordeaux.fr>
Co-authored-by: yocvito <nicolas.morel@etu.u-bordeaux.fr>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

tests/fuzzing/create_dict_corpus_file.py

@@ -0,0 +1,68 @@
+#!/bin/python3
+# /*
+#  * Copyright (C) 2022 Anna Stan ,  Mamaodou Dramé Kalilou , Nicolas Morel
+#  *
+#  * This program is free software; you can redistribute it and/or modify
+#  * it under the terms of the GNU General Public License as published by
+#  * the Free Software Foundation; either version 3 of the License, or
+#  * (at your option) any later version.
+#  *
+#  * This program is distributed in the hope that it will be useful,
+#  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  * GNU General Public License for more details.
+#  *
+#  * You should have received a copy of the GNU General Public License
+#  * along with this program; if not, see: <http://www.gnu.org/licenses/>.
+#  */
+import sys
+import mmap
+import argparse
+import shutil
+import os
+from os import O_RDONLY, O_RDWR, O_WRONLY, O_TRUNC, O_CREAT, SEEK_END, SEEK_CUR, SEEK_SET
+
+def main(argc, argv):
+  if argc < 2:
+    print('Summary: add file to the corpus ', file=sys.stderr)
+    print(f'Usage: {argv[0]} -c <corpus_dir>', file=sys.stderr)
+    exit(1)
+
+  ap = argparse.ArgumentParser()
+
+  # Add the arguments to the parser
+  ap.add_argument("-c", "--corpus_dir", required=True,
+  help="corpus directory where to add the file")
+  args = vars(ap.parse_args())
+
+
+  lang_list=os.getenv("FUZZ_VOICE")
+  if(lang_list):
+    list=lang_list+"_list"
+  else:
+    list="en_list"
+  output_name = list+"_dict_corpus.txt"
+  output_path=args['corpus_dir']+output_name
+  output= open(output_path, "w")
+
+  path="../../dictsource/"+list
+  
+
+  file = open( path, "r")
+  lines=file.readlines()
+  index=1
+  for line in lines:
+    if line[0]=='/' and line[1]=='/':
+      continue
+    res = line.split()
+    if len(res):
+      output.write("kw")
+      output.write(str(index))
+      index=index+1
+      output.write("=")
+      output.write(res[0])
+      output.write('\n')
+  file.close()
+  output.close()
+if __name__ == "__main__":
+  main(len(sys.argv), sys.argv)