Revert "reduce worktree clutter by AC_CONFIG_AUX_DIR"

This reverts commit 6b2e43e87d970c7fe366d778fc6da1faf6841794.
Dependency tracking doesn't work when AC_CONFIG_AUX_DIR is on

Conflicts:
	.gitignore
configure fuzzy if blocks

Signed-off-by: Sergei Ianovich <ynvich@gmail.com>