configure_file: Use utf-8 to write configured file
configure_file: Use utf-8 to write configured file

as a second part of
https://github.com/mesonbuild/meson/issues/1085

jeandet/meson,becm/meson,wberrier/meson,aaronp24/meson,QuLogic/meson,fmuellner/meson,jeandet/meson,QuLogic/meson,fmuellner/meson,mesonbuild/meson,fmuellner/meson,mesonbuild/meson,pexip/meson,thiblahute/meson,pexip/meson,wberrier/meson,MathieuDuponchelle/meson,pexip/meson,rhd/meson,QuLogic/meson,mesonbuild/meson,thiblahute/meson,ernestask/meson,wberrier/meson,jeandet/meson,trhd/meson,aaronp24/meson,fmuellner/meson,MathieuDuponchelle/meson,pexip/meson,rhd/meson,aaronp24/meson,thiblahute/meson,trhd/meson,mesonbuild/meson,trhd/meson,fmuellner/meson,QuLogic/meson,QuLogic/meson,ernestask/meson,mesonbuild/meson,pexip/meson,rhd/meson,becm/meson,jeandet/meson,wberrier/meson,QuLogic/meson,trhd/meson,jpakkane/meson,aaronp24/meson,wberrier/meson,mesonbuild/meson,becm/meson,ernestask/meson,becm/meson,fmuellner/meson,jpakkane/meson,wberrier/meson,trhd/meson,ernestask/meson,pexip/meson,ernestask/meson,trhd/meson,thiblahute/meson,jpakkane/meson,wberrier/meson,jpakkane/meson,rhd/meson,ernestask/meson,jpakkane/meson,MathieuDuponchelle/meson,pexip/meson,becm/meson,QuLogic/meson,jpakkane/meson,MathieuDuponchelle/meson,jpakkane/meson,jeandet/meson,jpakkane/meson,jeandet/meson,MathieuDuponchelle/meson,becm/meson,aaronp24/meson,becm/meson,becm/meson,trhd/meson,mesonbuild/meson,MathieuDuponchelle/meson,trhd/meson,trhd/meson,rhd/meson,wberrier/meson,mesonbuild/meson,aaronp24/meson,MathieuDuponchelle/meson,mesonbuild/meson,thiblahute/meson,becm/meson,thiblahute/meson,ernestask/meson,jeandet/meson,jeandet/meson,rhd/meson,ernestask/meson,rhd/meson,fmuellner/meson,QuLogic/meson,aaronp24/meson,fmuellner/meson,thiblahute/meson,aaronp24/meson,pexip/meson,fmuellner/meson,mesonbuild/meson,thiblahute/meson,becm/meson,pexip/meson,QuLogic/meson,thiblahute/meson,pexip/meson,MathieuDuponchelle/meson,jeandet/meson,jpakkane/meson,ernestask/meson,aaronp24/meson,MathieuDuponchelle/meson,rhd/meson