[Hack] Windows Doesn't Support Globstar 'find'

Author: CodaFi

test/Incremental/fail/main.swift

@@ -1,3 +1,6 @@
+// UNSUPPORTED: OS=windows-msvc
+// 'find' trick is non-portable...
+
 // RUN: %empty-directory(%t)
 // RUN: %{python} %S/../gen-output-file-map.py -o %t %S/Inputs
 // RUN: find %S -name "*.swift" > %t/Sources.resp

test/Incremental/multi-file/main.swift

@@ -1,3 +1,6 @@
+// UNSUPPORTED: OS=windows-msvc
+// 'find' trick is non-portable...
+
 // RUN: %empty-directory(%t)
 // RUN: %{python} %S/../gen-output-file-map.py -o %t %S/Inputs
 // RUN: find %S -name "*.swift" > %t/Sources.resp