ICU-2832 Fix the definition for _C99_Property_Function on several platforms.

X-SVN-Rev: 11801

icu4c/source/common/uniset.cpp

@@ -69,9 +69,9 @@ static const char NAME_PROP[] = "na"; // Unicode name property alias
 // TODO: Remove the following special-case code when
 // these four C99-compatibility properties are implemented
 // as enums/names.
-extern "C" {
-    typedef UBool (*_C99_Property_Function)(UChar32);
-}
+U_CDECL_BEGIN
+    typedef UBool (U_CALLCONV *_C99_Property_Function)(UChar32);
+U_CDECL_END
 struct _C99_Map {
     const char* name;
     _C99_Property_Function func;