dnsapi: Add a stub for DnsFlushResolverCache.

dlls/dnsapi/dnsapi.spec

@@ -31,7 +31,7 @@
 @ stdcall DnsExtractRecordsFromMessage_UTF8(ptr long ptr)
 @ stdcall DnsExtractRecordsFromMessage_W(ptr long ptr)
 @ stub DnsFindAuthoritativeZone
-@ stub DnsFlushResolverCache
+@ stdcall DnsFlushResolverCache()
 @ stub DnsFlushResolverCacheEntry_A
 @ stub DnsFlushResolverCacheEntry_UTF8
 @ stub DnsFlushResolverCacheEntry_W

dlls/dnsapi/main.c

@@ -90,6 +90,16 @@ DNS_STATUS WINAPI DnsAcquireContextHandle_W( DWORD flags, PVOID cred,
 }
 
 /******************************************************************************
+ * DnsFlushResolverCache               [DNSAPI.@]
+ *
+ */
+VOID WINAPI DnsFlushResolverCache(void)
+{
+    FIXME(": stub\n");
+}
+
+
+/******************************************************************************
  * DnsReleaseContextHandle                [DNSAPI.@]
  *
  */