Ignore a few more autoconf generated files

Author: takev

.gitignore

@@ -1,3 +1,4 @@
+*~
 aclocal.m4
 config.guess
 config.h.in
@@ -6,4 +7,9 @@ depcomp
 install-sh
 ltmain.sh
 missing
-
+autom4te.cache/
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4