All DkML MSVC compiler to fail

.github/workflows/dkml.yml

@@ -38,7 +38,7 @@ jobs:
   build:
     strategy:
       matrix:
-        include: # 
+        include: #
           - gh_os: windows-2019
             abi_pattern: win32-windows_x86
             dkml_host_abi: windows_x86
@@ -49,6 +49,10 @@ jobs:
     runs-on: ${{ matrix.gh_os }}
     name: build / ${{ matrix.abi_pattern }}
 
+    # mirage-crypto does not support MSVC as of 2023-09-03. Remove
+    # this when MSVC is properly supported.
+    continue-on-error: true
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -67,7 +71,7 @@ jobs:
 
       # The .ci/dkml-compilers "pre" actions will create the environment variables:
       #   opam_root, exe_ext, dkml_host_abi, abi_pattern (and many more)
-      # 
+      #
       - name: Setup DkML compilers on a Windows host
         if: startsWith(matrix.dkml_host_abi, 'windows_')
         uses: ./.ci/dkml-compilers/gh-windows/pre