Fixes unwanted execution of {aclocal,automake}-${latest_version} for the
case configure.ac (or something) is patched, but configure is also alredy
regenerated and aclocal and automake are not required (not in USE_TOOLS).
XXX: if {aclocal,automake}-${latest_version} is really required by somewhere,
XXX: it should be created below, same as plain aclocal and automake.