add VS2017 support for EDK2, including ARM and AARCH64 builds

* That's the way you do it!

EfiFsPkg.dsc

@@ -50,8 +50,12 @@
   MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
 
 [LibraryClasses.ARM, LibraryClasses.AARCH64]
+!if $(TOOLCHAIN) != "VS2017" || $(ARCH) != "AARCH64" 
   NULL|ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
+!endif
+!if $(TOOLCHAIN) != "VS2017"
   NULL|MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
+!endif
 
 ###################################################################################################
 #

README.md

@@ -44,7 +44,7 @@ For additional info as well as precompiled drivers, see http://efi.akeo.ie
 * From a command prompt, set Grub to target the platform you are compiling for by invoking:
   * (Windows) `set_grub_cpu.cmd <arch>`
   * (Linux) `./set_grub_cpu.sh <arch>`  
-  Where `<arch>` is one of `ia32`, `x64`, `arm` or `aa64`.  
+  Where `<arch>` is one of `ia32`, `x64`, `arm` or `aarch64`.  
   Note that you __MUST__ invoke the `set_grub_cpu` script __every time you switch target__.
 * After having invoked `Edk2Setup.bat` (Windows) or `edksetup.sh` (Linux) run something like:  
   ```
@@ -55,6 +55,14 @@ For additional info as well as precompiled drivers, see http://efi.akeo.ie
   ```
   build -a X64 -b RELEASE -t <toolchain> -p EfiFsPkg/EfiFsPkg.dsc -m EfiFsPkg/EfiFsPkg/Ntfs.inf
   ```
+* Note that you __can__ invoke a `VS2017` toolchain for building with the EDK2, that includes
+  build support for both the `ARM` and `AARCH64` targets (which the default EDK2 still doesn't
+  provide for Visual Studio), by applying the patches from the `edk2` subdirectory.
+
+  For instance, after applying the patches, you will be able to issue the following on Windows:
+  ```
+  build -a AARCH64 -b RELEASE -t VS2017 -p EfiFsPkg/EfiFsPkg.dsc
+  ```
 
 ## Testing
 

edk2/0001-EDK2-Add-BaseTools-Bin-Win32-as-a-git-module.patch

@@ -0,0 +1,32 @@
+From 7265f2b1701330b78aeb6799955bd1e5dfe7c67b Mon Sep 17 00:00:00 2001
+From: Pete Batard <[email protected]>
+Date: Tue, 7 Nov 2017 17:59:27 +0000
+Subject: [PATCH 1/2] EDK2 - Add BaseTools/Bin/Win32 as a git module
+
+* Makes things A LOT easier
+---
+ .gitmodules         | 3 +++
+ BaseTools/Bin/Win32 | 1 +
+ 2 files changed, 4 insertions(+)
+ create mode 100644 .gitmodules
+ create mode 160000 BaseTools/Bin/Win32
+
+diff --git a/.gitmodules b/.gitmodules
+new file mode 100644
+index 0000000..c5f5c11
+--- /dev/null
++++ b/.gitmodules
+@@ -0,0 +1,3 @@
++[submodule "BaseTools/Bin/Win32"]
++	path = BaseTools/Bin/Win32
++	url = https://github.com/tianocore/edk2-BaseTools-win32
+diff --git a/BaseTools/Bin/Win32 b/BaseTools/Bin/Win32
+new file mode 160000
+index 0000000..56e87e6
+--- /dev/null
++++ b/BaseTools/Bin/Win32
+@@ -0,0 +1 @@
++Subproject commit 56e87e680716323de849a10eb836cd3b299b844d
+-- 
+2.9.3.windows.2
+