Merge pull request swiftlang#269 from swiftwasm/main

[pull] swiftwasm from main

Author: pull[bot]

CoreFoundation/Base.subproj/SwiftRuntime/TargetConditionals.h

@@ -112,20 +112,23 @@
 #define TARGET_OS_WINDOWS      1
 #define TARGET_OS_BSD          0
 #define TARGET_OS_ANDROID      0
+#define TARGET_OS_CYGWIN       0
 #define TARGET_OS_WASI         0
 #elif __unix__
 #define TARGET_OS_DARWIN       0
 #define TARGET_OS_LINUX        0
 #define TARGET_OS_WINDOWS      0
 #define TARGET_OS_BSD          1
 #define TARGET_OS_ANDROID      0
+#define TARGET_OS_CYGWIN       0
 #define TARGET_OS_WASI         0
 #elif __wasi__
 #define TARGET_OS_DARWIN       0
 #define TARGET_OS_LINUX        0
 #define TARGET_OS_WINDOWS      0
 #define TARGET_OS_BSD          0
 #define TARGET_OS_ANDROID      0
+#define TARGET_OS_CYGWIN       0
 #define TARGET_OS_WASI         1
 #else
 #error unknown operating system