ci: use a more generic way of finding mt.exe

This sets up a vs developer command prompt and should hopefully should
be more resilient to upstream changes

Co-authored-by: David Gumberg <davidzgumberg@gmail.com>

.github/workflows/ci.yml

@@ -211,7 +211,8 @@ jobs:
     steps:
       - *CHECKOUT
 
-      - name: Set up VS Developer Prompt
+      - &SET_UP_VS
+        name: Set up VS Developer Prompt
         shell: pwsh -Command "$PSVersionTable; $PSNativeCommandUseErrorActionPreference = $true; $ErrorActionPreference = 'Stop'; & '{0}'"
         run: |
           $vswherePath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
@@ -374,19 +375,14 @@ jobs:
       - name: Run bitcoind.exe
         run: ./bin/bitcoind.exe -version
 
-      - name: Find mt.exe tool
-        shell: pwsh
-        run: |
-          $sdk_dir = (Get-ItemProperty 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows Kits\Installed Roots' -Name KitsRoot10).KitsRoot10
-          $sdk_latest = (Get-ChildItem "$sdk_dir\bin" -Directory | Where-Object { $_.Name -match '^\d+\.\d+\.\d+\.\d+$' } | Sort-Object Name -Descending | Select-Object -First 1).Name
-          "MT_EXE=${sdk_dir}bin\${sdk_latest}\x64\mt.exe" >> $env:GITHUB_ENV
+      - *SET_UP_VS
 
       - name: Get bitcoind manifest
         shell: pwsh
         run: |
-          & $env:MT_EXE -nologo -inputresource:bin\bitcoind.exe -out:bitcoind.manifest
+          mt.exe -nologo -inputresource:bin\bitcoind.exe -out:bitcoind.manifest
           Get-Content bitcoind.manifest
-          & $env:MT_EXE -nologo -inputresource:bin\bitcoind.exe -validate_manifest
+          mt.exe -nologo -inputresource:bin\bitcoind.exe -validate_manifest
 
       - name: Run unit tests
         # Can't use ctest here like other jobs as we don't have a CMake build tree.