Add clang-cl arm64 builds

Nothing too tricky...
   1) tell clang-cl to --target=arm64-windows
   2) work around minor libpng issue temporarily

Change-Id: I4f0d792438610268821b67b92caf08fd78dcec4f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/208882
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/infra/bots/jobs.json b/infra/bots/jobs.json
index e2e10c5..7f3ab5c 100644
--- a/infra/bots/jobs.json
+++ b/infra/bots/jobs.json
@@ -97,6 +97,10 @@
   "Build-Mac-Clang-x86_64-Release-Metal",
   "Build-Mac-Clang-x86_64-Release-MoltenVK_Vulkan",
   "Build-Mac-Clang-x86_64-Release-TSAN",
+  "Build-Win-Clang-arm64-Debug",
+  "Build-Win-Clang-arm64-Debug-ANGLE",
+  "Build-Win-Clang-arm64-Release",
+  "Build-Win-Clang-arm64-Release-ANGLE",
   "Build-Win-Clang-arm64-Release-Android",
   "Build-Win-Clang-x86-Debug",
   "Build-Win-Clang-x86-Debug-Exceptions",