Lapatinib in Treating Patients With Recurrent and/or Metastatic Head and Neck Cancer

metastatic squamous neck cancer with occult primary, recurrent metastatic squamous neck cancer with occult primary, recurrent squamous cell carcinoma of the hypopharynx, recurrent squamous cell carcinoma of the larynx, recurrent squamous cell carcinoma of the lip and oral cavity, recurrent squamous cell carcinoma of the nasopharynx, recurrent squamous cell carcinoma of the oropharynx, recurrent squamous cell carcinoma of the paranasal sinus and nasal cavity, salivary gland squamous cell carcinoma, stage iv squamous cell carcinoma of the hypopharynx, stage iv squamous cell carcinoma of the larynx, stage iv squamous cell carcinoma of the lip and oral cavity