Properly excluding read_one_byte_at_4G test from WinRT.

Author: stgates

Release/tests/Functional/streams/fstreambuf_tests.cpp

@@ -23,10 +23,8 @@
 #include "stdafx.h"
 
 #ifdef _MS_WINDOWS
-#if !defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)
 #include "CppSparseFile.h"
 #endif
-#endif
 
 #if defined(__cplusplus_winrt)
 using namespace Windows::Storage;
@@ -942,7 +940,7 @@ TEST(file_with_one_byte_size)
 }
 #endif
 
-#if defined(_MS_WINDOWS) && (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)) && defined(_WIN64)
+#if defined(_MS_WINDOWS) && (!defined(__cplusplus_winrt)) && defined(_WIN64)
 // since casablanca does not use sparse file apis we're not doing the reverse test (write one byte at 4Gb and verify with std apis)
 // because the file created would be too big
 TEST(read_one_byte_at_4G)