Who is a Hindu?

आसिंधु सिंधु पर्यन्ता यस्य भारतभूमिका ।
 पितृभू: पुण्यभूश्चैव स वै हिंदुरिति स्मृत: ॥
“Everyone who regards and claims this Bharatbhumi from the Indus to the Seas as his Fatherland and Holyland is a Hindu”
 —Veer Savarkar.