.gitignore: add more autotools detritus.

One of these days I should sit down and work out exactly when a run of
autoconf generates an autom4te.cache directory, and why it can
suddenly turn up unexpectedly one day after years of never needing to
put it in .gitignore!

diff --git a/.gitignore b/.gitignore
index 134cab17d03093da01ff263151679360dc50d1fd..bc9635bbeeb2bc630a42dd99d9722244c956a81d 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -107,6 +107,7 @@
 /preprocessed.but
 /*.a
 /aclocal.m4
+/autom4te.cache
 /config.log
 /config.status
 /configure