iconv: test: Simplify test setup
iconv: test: Simplify test setup

jessevdk/vte,flaxandteal/gasket-vte,thestinger/vte-ng,thestinger/vte-ng,flaxandteal/gasket-vte,jessevdk/vte,jessevdk/vte,rvu95/vte,flaxandteal/gasket-vte,rvu95/vte,jessevdk/vte,rvu95/vte,flaxandteal/gasket-vte,saitoha/vte-sixel,thestinger/vte-ng,rvu95/vte,saitoha/vte-sixel,saitoha/vte-sixel