chore(.gitignore): add more autotool files (#792)

* chore(.gitignore): group autotool generated files

Author: akinomyoga

.gitignore

@@ -2,17 +2,19 @@
 *.tar*
 *~
 .pytest_cache/
-Makefile
-Makefile.in
 __pycache__/
 pytestdebug.log
 /.python-version
-/aclocal.m4
-/autom4te.cache
 /bash-completion-config-version.cmake
 /bash-completion-config.cmake
 /bash-completion.pc
 /bash_completion.sh
+
+# Files generated by autotools
+Makefile
+Makefile.in
+/aclocal.m4
+/autom4te.cache/
 /config.log
 /config.status
 /configure