shutils/chroot.sh: add /bin:/sbin to PATH when executing xbps-src.
shutils/chroot.sh: use full path to the shell just in case.
shutils/chroot.sh: execute directly the xbps commands on the chroot.
shutils/chroot.sh: do not use ln -r, some coreutils versions don't support it.
install_files.sh: disable shell wildcards on v* commands, as they glob by themselves
install_files.sh: disable shell wildcards on v* commands, as they glob by themselves
Merge https://github.com/Gottox/xbps-src