Travis: Fix failures, update alpine-chroot-install to 0.7.0
Travis: Fix failures, update alpine-chroot-install to 0.7.0

Ubuntu has apparently deleted qemu-user-static packages for Zesty...
The script uses packages from Artful since 0.7.0.

WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen