kernel32: Add a stub for FlushProcessWriteBuffers.

dlls/kernel32/kernel32.spec

@@ -409,6 +409,7 @@
 @ stdcall FlushConsoleInputBuffer(long)
 @ stdcall FlushFileBuffers(long)
 @ stdcall FlushInstructionCache(long long long)
+@ stdcall FlushProcessWriteBuffers()
 @ stdcall FlushViewOfFile(ptr long)
 @ stdcall FoldStringA(long str long ptr long)
 @ stdcall FoldStringW(long wstr long ptr long)

dlls/kernel32/process.c

@@ -3856,5 +3856,12 @@ BOOL WINAPI GetProcessDEPPolicy(HANDLE process, LPDWORD flags, PBOOL permanent)
     FIXME("(%p %p %p): stub\n", process, flags, permanent);
     SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
     return FALSE;
+}
 
+/**********************************************************************
+ *           FlushProcessWriteBuffers     (KERNEL32.@)
+ */
+VOID WINAPI FlushProcessWriteBuffers(void)
+{
+    FIXME(": stub\n");
 }