Polls to elect a new president and parliament take place on 16 February, while governorship and state assembly elections take place two weeks later.
Hanekom, who is a South African, was being held as a suspected terrorist in Mozambique and died in custody on Wednesday.
The Paris climate accord has been shaken by the withdrawal of the United States under President Donald Trump, and by threats to do the same by Brazil's new hard-right leader Jair Bolsonaro.
The mob killing over the weekend followed the alleged rape of a seven-year-old girl.
South Sudan won independence from Sudan in 2011 following decades of brutal fighting marked by the mass abduction and enslavement of children, scorched earth ethnic cleansing and famines.
The 58-year-old singer fears the world risks losing the health battle, with governments around the globe increasingly overlooking the issue in order to resolve problems in their own countries.
Sarfraz denied that his comments in Urdu, caught on the stump microphones, were aimed at South African all-rounder Andile Phehlukwayo or anyone in particular.
Barkhuizen was suspended after a picture showing black and white pupils seated separately in a grade R class at Laerskool Schweizer Reneke went viral, sparking widespread outrage.