[windows-msvc] Add symlink for windows msvc.

Change-Id: I67e7f42d47db6fe174ff57a9fa8e7488f86e5695
diff --git a/windows_msvc-x86_64 b/windows_msvc-x86_64
new file mode 120000
index 0000000..4cc0a7f
--- /dev/null
+++ b/windows_msvc-x86_64
@@ -0,0 +1 @@
+windows-x86_64
\ No newline at end of file