Irinotecan and Cisplatin in Treating Patients With Recurrent or Metastatic Head and Neck Cancer

head and neck cancer, recurrent squamous cell carcinoma of the hypopharynx, stage iv squamous cell carcinoma of the hypopharynx, stage iv squamous cell carcinoma of the larynx, stage iv verrucous carcinoma of the larynx, recurrent squamous cell carcinoma of the larynx, recurrent verrucous carcinoma of the larynx, recurrent squamous cell carcinoma of the lip and oral cavity, stage iv squamous cell carcinoma of the lip and oral cavity, recurrent verrucous carcinoma of the oral cavity, stage iv verrucous carcinoma of the oral cavity, metastatic squamous neck cancer with occult primary squamous cell carcinoma