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work slightly differently than the simple Alien::Base case.  You can
feed in nothing at all, in which case you get back cflags and libs
strings appropriate for compiling *all* available fftw3 libraries; or
you can specify which precision you want by passing in an allowed
precision.  The allowed precisions are currently 'f','d','l', and 'q'
for floats, doubles, long doubles, and quad doubles respecetively.

On initial use, Alien::FFTW3 checks for which precisions are
available.  If more than zero are available, it succeeds.  If none are
available, then it fails.  If you specify a version number, it is
translated from Perl-style version numbers to a POSIX module version
string.  The load will throw an exception unless every located libfftw
external library is at that version or later.

You can query which precisions are installed on your system using the
"precision" method, documented below.

As an Alien module, Alien::FFTW3 attempts to build fftw on your system
from source if it's not found at install time.  Because I'm Lazy, I
use the existing Alien::Base infrastructure from Joel Berger to
install in that case.