winsys/sw/xlib: Convert to automake
diff --git a/configure.ac b/configure.ac
index 71d01f8..3903fd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2038,6 +2038,7 @@
 		src/gallium/winsys/sw/null/Makefile
 		src/gallium/winsys/sw/wayland/Makefile
 		src/gallium/winsys/sw/wrapper/Makefile
+		src/gallium/winsys/sw/xlib/Makefile
 		src/gbm/Makefile
 		src/gbm/main/gbm.pc
 		src/glsl/Makefile