dnsapi: Add a stub implementation of dnsapi.dll.
diff --git a/configure.ac b/configure.ac
index 98c799b..3cc9a65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1509,6 +1509,7 @@
 dlls/dmsynth/Makefile
 dlls/dmusic/Makefile
 dlls/dmusic32/Makefile
+dlls/dnsapi/Makefile
 dlls/dplay/Makefile
 dlls/dplayx/Makefile
 dlls/dpnet/Makefile