Enable detection of Win10 SDK from environment variable instead of registry (#1832)

Fix typo

cmake/modules/FindD3D12.cmake

@@ -1,13 +1,17 @@
 # Find the win10 SDK path.
-get_filename_component(WIN10_SDK_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\Microsoft SDKs\\Windows\\v10.0;InstallationFolder]" ABSOLUTE CACHE)
-get_filename_component(TEMP_WIN10_SDK_VERSION "[HKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\Microsoft SDKs\\Windows\\v10.0;ProductVersion]" ABSOLUTE CACHE)
-
-get_filename_component(WIN10_SDK_VERSION ${TEMP_WIN10_SDK_VERSION} NAME)
+if ("$ENV{WIN10_SDK_PATH}$ENV{WIN10_SDK_VERSION}" STREQUAL "" )
+  get_filename_component(WIN10_SDK_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\Microsoft SDKs\\Windows\\v10.0;InstallationFolder]" ABSOLUTE CACHE)
+  get_filename_component(TEMP_WIN10_SDK_VERSION "[HKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\Microsoft SDKs\\Windows\\v10.0;ProductVersion]" ABSOLUTE CACHE)
+  get_filename_component(WIN10_SDK_VERSION ${TEMP_WIN10_SDK_VERSION} NAME)
+elseif(TRUE)
+  set (WIN10_SDK_PATH $ENV{WIN10_SDK_PATH})
+  set (WIN10_SDK_VERSION $ENV{WIN10_SDK_VERSION})
+endif ("$ENV{WIN10_SDK_PATH}$ENV{WIN10_SDK_VERSION}" STREQUAL "" )
 
 # WIN10_SDK_PATH will be something like C:\Program Files (x86)\Windows Kits\10
-
 # WIN10_SDK_VERSION will be something like 10.0.14393 or 10.0.14393.0; we need the
 # one that matches the directory name.
+
 if (IS_DIRECTORY "${WIN10_SDK_PATH}/Include/${WIN10_SDK_VERSION}.0")
   set(WIN10_SDK_VERSION "${WIN10_SDK_VERSION}.0")
 endif (IS_DIRECTORY "${WIN10_SDK_PATH}/Include/${WIN10_SDK_VERSION}.0")

cmake/modules/FindDiaSDK.cmake

@@ -9,7 +9,7 @@ get_filename_component(VS15_C_PATH32 "$ENV{${PROGRAMFILES_X86}}/Microsoft Visual
 get_filename_component(VS15_P_PATH32 "$ENV{${PROGRAMFILES_X86}}/Microsoft Visual Studio/2017/Professional/Common7/IDE" ABSOLUTE CACHE)
 get_filename_component(VS15_E_PATH32 "$ENV{${PROGRAMFILES_X86}}/Microsoft Visual Studio/2017/Enterprise/Common7/IDE" ABSOLUTE CACHE)
 
-# Find the TAEF path, it will typically look something like this.
+# Find the DIA SDK path, it will typically look something like this.
 # C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\DIA SDK\include
 # C:\Program Files (x86)\Microsoft Visual Studio 14.0\DIA SDK\include\dia2.h
 find_path(DIASDK_INCLUDE_DIR    # Set variable DIASDK_INCLUDE_DIR