headers: add some Fiber API's allowed in winstore builds

https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createfiberex
https://docs.microsoft.com/en-us/windows/win32/api/fibersapi/nf-fibersapi-isthreadafiber
Signed-off-by: Liu Hao <lh_mouse@126.com>
diff --git a/mingw-w64-headers/include/fibersapi.h b/mingw-w64-headers/include/fibersapi.h
index 9c5ec83..888028f 100644
--- a/mingw-w64-headers/include/fibersapi.h
+++ b/mingw-w64-headers/include/fibersapi.h
@@ -23,11 +23,6 @@
   WINBASEAPI PVOID WINAPI FlsGetValue (DWORD dwFlsIndex);
   WINBASEAPI WINBOOL WINAPI FlsSetValue (DWORD dwFlsIndex, PVOID lpFlsData);
   WINBASEAPI WINBOOL WINAPI FlsFree (DWORD dwFlsIndex);
-#endif
-#endif
-
-#if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_DESKTOP)
-#if _WIN32_WINNT >= 0x0600
   WINBASEAPI WINBOOL WINAPI IsThreadAFiber (VOID);
 #endif
 #endif
diff --git a/mingw-w64-headers/include/winbase.h b/mingw-w64-headers/include/winbase.h
index c99ebd2..1f82987 100644
--- a/mingw-w64-headers/include/winbase.h
+++ b/mingw-w64-headers/include/winbase.h
@@ -1171,6 +1171,11 @@
 #if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_APP)
   WINBASEAPI VOID WINAPI RaiseFailFastException (PEXCEPTION_RECORD pExceptionRecord, PCONTEXT pContextRecord, DWORD dwFlags);
   WINBASEAPI DWORD WINAPI SetThreadIdealProcessor (HANDLE hThread, DWORD dwIdealProcessor);
+  WINBASEAPI LPVOID WINAPI CreateFiberEx (SIZE_T dwStackCommitSize, SIZE_T dwStackReserveSize, DWORD dwFlags, LPFIBER_START_ROUTINE lpStartAddress, LPVOID lpParameter);
+  WINBASEAPI VOID WINAPI DeleteFiber (LPVOID lpFiber);
+  WINBASEAPI VOID WINAPI SwitchToFiber (LPVOID lpFiber);
+  WINBASEAPI WINBOOL WINAPI ConvertFiberToThread (VOID);
+  WINBASEAPI LPVOID WINAPI ConvertThreadToFiberEx (LPVOID lpParameter, DWORD dwFlags);
 #endif
 
 #if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_DESKTOP)
@@ -1178,12 +1183,7 @@
 #define FIBER_FLAG_FLOAT_SWITCH 0x1
 
   WINBASEAPI LPVOID WINAPI CreateFiber (SIZE_T dwStackSize, LPFIBER_START_ROUTINE lpStartAddress, LPVOID lpParameter);
-  WINBASEAPI LPVOID WINAPI CreateFiberEx (SIZE_T dwStackCommitSize, SIZE_T dwStackReserveSize, DWORD dwFlags, LPFIBER_START_ROUTINE lpStartAddress, LPVOID lpParameter);
-  WINBASEAPI VOID WINAPI DeleteFiber (LPVOID lpFiber);
   WINBASEAPI LPVOID WINAPI ConvertThreadToFiber (LPVOID lpParameter);
-  WINBASEAPI LPVOID WINAPI ConvertThreadToFiberEx (LPVOID lpParameter, DWORD dwFlags);
-  WINBASEAPI WINBOOL WINAPI ConvertFiberToThread (VOID);
-  WINBASEAPI VOID WINAPI SwitchToFiber (LPVOID lpFiber);
   WINBASEAPI DWORD_PTR WINAPI SetThreadAffinityMask (HANDLE hThread, DWORD_PTR dwThreadAffinityMask);
 
   /* TODO: Add RTL_UMS... to winnt.h header and add UMS-base API.  */