windows.cfg: Added support for FlushFileBuffers(). Reference: https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-flushfilebuffers

cfg/windows.cfg

@@ -1763,6 +1763,14 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- BOOL FlushFileBuffers(HANDLE hFile);-->
+  <function name="FlushFileBuffers">
+    <noreturn>false</noreturn>
+    <returnValue type="BOOL"/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- BOOL WINAPI SetCommState(
   _In_  HANDLE hFile,
   _In_  LPDCB lpDCB);-->