* Makefile.in: Avoid pathnames as targets and target dependencies, as they may break make in presence of colons or whitespaces in pathnames as set by autoconf (e.g., --prefix=/data/bin-2019-10-04:19:39:35 or --exec-prefix=/tmp/data/bin-2019-10-04:19:39:35). Thanks to Héctor Romojaro for reporting.