Documentation: Reorganize the build documentation

Documentation/BuildInstructionsOther.md

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+# Installing build requisites on other systems
+
+## openSUSE
+
+```console
+sudo zypper install curl cmake mpfr-devel mpc-devel ninja gmp-devel e2fsprogs patch qemu-x86 qemu-audio-pa gcc gcc-c++ ccache rsync patterns-devel-C-C++-devel_C_C++
+```
+
+## Arch Linux / Manjaro
+
+```console
+sudo pacman -S --needed base-devel cmake curl mpfr libmpc gmp e2fsprogs ninja qemu qemu-arch-extra ccache rsync
+```
+
+## Void Linux
+
+```console
+sudo xbps-install -S base-devel cmake curl mpfr-devel libmpc-devel gmp-devel e2fsprogs ninja qemu ccache rsync
+```
+
+## ALT Linux
+
+```console
+apt-get install curl cmake libmpc-devel gmp-devel e2fsprogs libmpfr-devel ninja-build patch gcc ccache rsync
+```
+
+## NixOS
+
+You can use a `nix-shell` script like the following to set up the correct environment:
+
+myshell.nix:
+
+```
+with import <nixpkgs> {};
+
+stdenv.mkDerivation {
+  name = "cpp-env";
+  nativeBuildInputs = [
+    gcc10
+    curl
+    cmake
+    mpfr
+    ninja
+    gmp
+    libmpc
+    e2fsprogs
+    patch
+    ccache
+    rsync
+
+    # Example Build-time Additional Dependencies
+    pkgconfig
+  ];
+  buildInputs = [
+    # Example Run-time Additional Dependencies
+    openssl
+    x11
+    # glibc
+  ];
+  hardeningDisable = [ "format" "fortify" ];
+}
+```
+
+Then use this script: `nix-shell myshell.nix`.
+
+Once you're in nix-shell, you should be able to follow the build directions.
+
+## Alpine Linux
+
+First, make sure you have enabled the `community` repository in `/etc/apk/repositories` and run `apk update`. It has been tested on `edge`, YMMV on `stable`.
+
+```console
+# the basics, if you have not already done so
+apk add bash curl git util-linux sudo
+
+# rough equivalent of build-essential
+apk add build-base
+
+# qemu
+apk add qemu qemu-system-i386 qemu-img qemu-ui-gtk
+
+# build tools (samurai is a drop-in replacement for ninja)
+apk add cmake e2fsprogs grub-bios samurai mpc1-dev mpfr-dev gmp-dev ccache rsync
+```
+
+## OpenBSD prerequisites
+
+```console
+$ doas pkg_add bash cmake g++ gcc git gmake gmp ninja ccache rsync coreutils qemu sudo
+```
+
+## FreeBSD prerequisites
+
+```console
+$ pkg install bash coreutils git gmake ninja sudo gmp mpc mpfr ccache rsync
+```
+