Make .gitignore aware of autoconf artefacts
diff --git a/.gitignore b/.gitignore
index d9c08ad..8bc903b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,15 @@
 *.so
 *~
 .*
+autom4te.cache
+aclocal.m4
+config.log
+config.status
+configure
+compile
+depcomp
+install-sh
+missing
+Makefile.in
+Makefile
+Makefile.am.sample