build: Update .gitignore for 2017-03-11 change in gnulib.

diff --git a/.gitignore b/.gitignore
index 300470b87a18285e928a31cd2f9c3474995ebd18..6953e7e69e55ced29d7a441429ca2fedfd525119 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -284,7 +284,6 @@
 /gettext-tools/tests/init.sh
 
 # Files brought in by "automake --add-missing --copy":
-/build-aux/ar-lib
 /build-aux/compile
 /build-aux/depcomp
 /build-aux/elisp-comp