include: Add endpointvolume.idl.
diff --git a/.gitignore b/.gitignore
index dcf494f..4b1166a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -145,6 +145,7 @@
 include/downloadmgr.h
 include/dxgi.h
 include/dxgitype.h
+include/endpointvolume.h
 include/exdisp.h
 include/fusion.h
 include/hlink.h