unformalized windows patches for enumerations

Windows uses signed enumerations by default rather than unsigned.  This
results in the values triggering warnings on Windows.

Author: compnerd

dispatch/base.h

@@ -208,7 +208,7 @@
 #endif
 #endif
 
-#if __has_feature(objc_fixed_enum) || __has_extension(cxx_strong_enums)
+#if __has_feature(objc_fixed_enum) || __has_extension(cxx_strong_enums) || defined(_WIN32)
 #define DISPATCH_ENUM(name, type, ...) \
 		typedef enum : type { __VA_ARGS__ } name##_t
 #else

src/object_internal.h

@@ -340,7 +340,7 @@ DISPATCH_ENUM(dispatch_invoke_flags, uint32_t,
 #define _DISPATCH_INVOKE_AUTORELEASE_MASK	  0x00300000u
 );
 
-enum {
+enum : unsigned long {
 	_DISPATCH_META_TYPE_MASK		= 0xffff0000, // mask for object meta-types
 	_DISPATCH_TYPEFLAGS_MASK		= 0x0000ff00, // mask for object typeflags
 	_DISPATCH_SUB_TYPE_MASK			= 0x000000ff, // mask for object sub-types