Enable 64bit enums on Windows and Fix CFDateComponentUndefined

Since CoreFoundation on Windows doesn't compile with cplusplus and
doesn't have objc_fixed_enum, it goes down the wrong path for enums and
defaults them to a 32 bit backing.

This causes CFDateComponentUndefined to be 32bit value which then
doesn't match NSDateComponentUndefined which is an Int64.

Author: gmittert

CoreFoundation/Base.subproj/CFAvailability.h

@@ -123,7 +123,7 @@
 #endif
 
 #define __CF_ENUM_GET_MACRO(_1, _2, NAME, ...) NAME
-#if (__cplusplus && __cplusplus >= 201103L && (__has_extension(cxx_strong_enums) || __has_feature(objc_fixed_enum))) || (!__cplusplus && __has_feature(objc_fixed_enum))
+#if (__cplusplus && __cplusplus >= 201103L && (__has_extension(cxx_strong_enums) || __has_feature(objc_fixed_enum))) || (!__cplusplus && (__has_feature(objc_fixed_enum) || __has_extension(cxx_fixed_enum)))
 #define __CF_NAMED_ENUM(_type, _name)     enum __CF_ENUM_ATTRIBUTES _name : _type _name; enum _name : _type
 #define __CF_ANON_ENUM(_type)             enum __CF_ENUM_ATTRIBUTES : _type
 #define CF_CLOSED_ENUM(_type, _name)      enum __CF_CLOSED_ENUM_ATTRIBUTES _name : _type _name; enum _name : _type

CoreFoundation/Locale.subproj/CFDateComponents.h

@@ -16,8 +16,13 @@ CF_IMPLICIT_BRIDGING_ENABLED
 CF_EXTERN_C_BEGIN
 CF_ASSUME_NONNULL_BEGIN
 
+// Must match NSDateComponentUndefined
 CF_ENUM(CFIndex) {
-    CFDateComponentUndefined = __LONG_MAX__ // Must match NSDateComponentUndefined
+#if TARGET_OS_WIN32
+    CFDateComponentUndefined = LLONG_MAX
+#else
+    CFDateComponentUndefined = __LONG_MAX__
+#endif
 };
 
 enum {