winrt: Fix API usage certification

According to MSDN Tls* is inline replaced by Fls* on Windows (Phone) 8.1
and beyond.
However, this does not seem to be the case for Windows 10. An
application links against Tls* and the certification step fails due to
using non-allowed APIs.

Hence we do the inline replacement manually. QThreadStorage and QThread
tests continue to work, so it seems to be an oversight by Microsoft.

Task-number: QTBUG-50292
Change-Id: Ice1b6e54fcee238c94af5c6fb1753d903db7476d
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>

src/corelib/thread/qthread_win.cpp

@@ -69,6 +69,30 @@
 #ifndef QT_NO_THREAD
 QT_BEGIN_NAMESPACE
 
+#ifdef Q_OS_WINRT
+inline DWORD qWinRTTlsAlloc() {
+    return FlsAlloc(0);
+}
+
+inline bool qWinRTTlsFree(DWORD dwTlsIndex) {
+    return FlsFree(dwTlsIndex);
+}
+
+inline LPVOID qWinRTTlsGetValue(DWORD dwTlsIndex) {
+    return FlsGetValue(dwTlsIndex);
+}
+
+inline bool qWinRTTlsSetValue(DWORD dwTlsIndex, LPVOID lpTlsValue) {
+    return FlsSetValue(dwTlsIndex, lpTlsValue);
+}
+
+#define TlsAlloc qWinRTTlsAlloc
+#define TlsFree qWinRTTlsFree
+#define TlsSetValue qWinRTTlsSetValue
+#define TlsGetValue qWinRTTlsGetValue
+
+#endif // Q_OS_WINRT
+
 void qt_watch_adopted_thread(const HANDLE adoptedThreadHandle, QThread *qthread);
 DWORD WINAPI qt_adopted_thread_watcher_function(LPVOID);