Replace `i8` with `libc::c_char`
Replace `i8` with `libc::c_char`

nc4rrillo/glutin,tomaka/winit,vberger/glutin,servo/glutin,tomaka/glutin,bvssvni/glutin,mitchmindtree/glutin,mbrubeck/glutin,ecoal95/glutin,mbrubeck/glutin,ozkriff/glutin