automake: do not emit rule with two dependents

On a system using our replacement alloca, make would emit
this warning:
  target '.deps/alloca.Po' given more than once in the same rule
That arose because automake would emit a rule depending on both
./.deps/alloca.Po and .deps/alloca.Po. Normally, duplicate
dependents are avoided by virtue of their names being keys in
the %dep_files hash, but in this case, that particular file
was specified in two different ways.
* bin/automake.in (handle_ALLOCA): When the $dir prefix is empty,
make it './', to ensure that when we add ./.deps/alloca.Po
it is deduped.
See: http://bugs/gnu/org/22702

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