message: Update the Windows build notes
  Clarify the Windows Subsystem For Linux section.
  Clarify the build requirements.
diff: @@ -12,9 +12,11 @@ A second alternative way of building on windows using msys / mingw-w64 is docume
  Compiling with Windows Subsystem For Linux
  -------------------------------------------
  -With Windows 10, Microsoft has released a new feature named the [Windows Subsystem for Linux](https://msdn.microsoft.com/commandline/wsl/about). This feature allows you to run a bash shell directly on Windows in an Ubuntu based environment. Within this environment you can cross compile for Windows without the need for a separate Linux VM or Server.
  +With Windows 10, Microsoft has released a new feature named the [Windows Subsystem for Linux](https://msdn.microsoft.com/commandline/wsl/about). This feature allows you to run a bash shell directly on Windows in an Ubuntu-based environment. Within this environment you can cross compile for Windows without the need for a separate Linux VM or server.
  -This feature is not supported in versions of Windows prior to Windows 10 or on Windows Server SKUs.
  +This feature is not supported in versions of Windows prior to Windows 10 or on
  +Windows Server SKUs. In addition, it is available [only for 64-bit versions of
  +Windows](https://msdn.microsoft.com/en-us/commandline/wsl/install_guide).
  To get the bash shell, you must first activate the feature in Windows.
  @@ -32,7 +34,9 @@ To get the bash shell, you must first activate the feature in Windows.
  * Accept the license
  * Create a new UNIX user account (this is a separate account from your Windows account)
  -After the bash shell is active, you can follow the instructions below for Windows 64-bit Cross-compilation.
  +After the bash shell is active, you can follow the instructions below, starting
  +with the "Cross-compilation" section. Compiling the 64-bit version is
  +recommended but it is possible to compile the 32-bit version.
  Cross-compilation
  -------------------
  @@ -56,7 +60,7 @@ To build executables for Windows 64-bit, install the following dependencies:
  Then build using:
  cd depends
  - make HOST=x86_64-w64-mingw32 -j4
  + make HOST=x86_64-w64-mingw32
  cd ..
  ./autogen.sh # not required when building from tarball
  CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure --prefix=/
  @@ -71,7 +75,7 @@ To build executables for Windows 32-bit, install the following dependencies:
  Then build using:
  cd depends
  - make HOST=i686-w64-mingw32 -j4
  + make HOST=i686-w64-mingw32
  cd ..
  ./autogen.sh # not required when building from tarball
  CONFIG_SITE=$PWD/depends/i686-w64-mingw32/share/config.site ./configure --prefix=/
  @@ -86,4 +90,3 @@ as they appear in the release `.zip` archive. This can be done in the following
  way. This will install to `c:\workspace\bitcoin`, for example:
  make install DESTDIR=/mnt/c/workspace/bitcoin
  -
  