Add Redox target in the native_bootstrap.sh script

Once all build system tooling recipes are ported, the Redox package manager function and command must be added on the script.

We can do this before the fully porting by adding the Redox function and package manager command as a comment.

• A function to detect if the OS is Redox.
• A function to detect what packages are installed.

Package manager command

 sudo pkg install rust \
 cargo \
 gcc \
 gnu-make \
 bison \
 cmake \
 wget \
 file \
 flex \
 gperf \
 expat \
 libgmp \
 libpng \
 libjpeg \
 sdl \
 sdl2-ttf \
 html-parser-perl \
 libtool \
 m4 \
 nasm \
 patch \
 automake \
 autoconf \
 scons \
 pkg-config \
 po4a \
 texinfo \
 ninja-build \
 meson \
 python \
 python3-mako \
 xdg-utils \
 vim \
 perl \
 doxygen