tests: reimplement wrappers for automake and aclocal in perl

tests: reimplement wrappers for automake and aclocal in perl

This will allow us to avoid one extra shell invocation per automake
and aclocal invocation in our testsuite, and, more importantly, will
allow us not to worry about potential shell portability issues, at
least in those wrappers.  For an example of such a portability issue,
refer to the recent commit v1.12.2-80-g65dadf6 "tests: work around a
ksh bug w.r.t. ${1+"$@"}".

* t/wrap/automake.in, t/wrap/aclocal.in: Rewritten in perl.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>