i915/winsys/drm: Convert to automake
diff --git a/configure.ac b/configure.ac
index 147589d..e2af081 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2018,6 +2018,7 @@
 		src/gallium/targets/Makefile
 		src/gallium/targets/opencl/Makefile
 		src/gallium/winsys/Makefile
+		src/gallium/winsys/i915/drm/Makefile
 		src/gallium/winsys/radeon/drm/Makefile
 		src/gbm/Makefile
 		src/gbm/main/gbm.pc