Rather than expecting a pointer, the version of 'mount' in guile-static-stripped now takes a string for the 'options' argument, just like the 'mount' procedure in (guix build syscalls). * gnu/packages/patches/guile-linux-syscalls.patch (mount): Expect a string or #f for 'options' argument. * gnu/build/file-systems.scm (mount-file-system): Use new 'mount' interface.