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Some cookbook entries were failing with an error like this:

```
error: no such subcommand: `config`
```

We can install this subcommand from the bootstrap script, and also
instruct folks in the README to do so manually.

SamwiseFilmore authored Oct 27, 2019 and Jeremy Soller committed Oct 27, 2019

The script shouldn't upgrade a system, period, see my comments. I also
added a cli option to run the bootstrap with an update of the git stuff
and run rustup, plus a help flag and the statusCheck.

flex, byacc, texinfo

Add `texinfo` package that is needed because the build process requires
`makeinfo` tool, that's part of that package.

texinfo components are needed for building the prefix toolchain.
NOTE: Other distros likely need similar mods.

These packages are also required to build the C apps in the cookbook and to generate the live ISO image. Tested with a clean install of Ubuntu Server 16.04.4 and Pop!_OS Intel 62.

Checking that xargo isn't already installed before trying to install it - should prevent the bootstrap script erroring out in an ugly way.

Noticed that full help option was missing, added it.

See https://github.com/redox-os/redox/issues/1052

This is just something fast I threw together to get the general idea across of what might fix the problem.  I've not yet had a chance to test this.

In order to have ``qemu-system-x86_64`` we need to enable ``x86_64`` on ``QEMU_SOFTMMU_TARGETS``, not ``i386``

The bootstrap.sh script always installs fuse on gentoo. This small change just checks if it is already installed and skip it if so.

macOS again.

Details

- We are using the toolchain compiler and archiver in order
to generate a proper ELF file when building the 'raw-cpuid'
crate C code which is currently being compiled by the macOS
toolchain.

- I added the 'findutils' and 'coreutils' Homebrew/MacPorts
packages to the bootstrap script in order to setup the proper
environment for the cookbook scripts (as the assume GNU tools).
This should be temporary until the cookbook scripts get migrated
to Rust.

Added build dependencies for Solus.

The help also tells you to use './bootstrap.sh' but the file wasn't +x in
the repo, so I've set that +x as well.

This closes issue #852

On my OS X El Capitan machine `which` returns 1 if it can't find the binary. This kills the bootstrap script at the crucial moment when it detects that something needs to be installed. This change ignores unsuccessful exit codes from `which`. The man page for my `which` speaks of a `-s` switch that could be used instead of the `if [ -z`, but I don't know how portable this is.

This fixes Issue 850.

fusermount is in the fuse package.