[parrot/parrot] a12348: nci/libffi.c: check FLOATTYPE, not NUMVAL_SIZE

[GitHub]

  Branch: refs/heads/native_pbc2
  Home:   https://github.com/parrot/parrot
  Commit: a12348e2bb823eb3e20772c47e24726d0d03d655
      https://github.com/parrot/parrot/commit/a12348e2bb823eb3e20772c47e24726d0d03d655
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2012-10-05 (Fri, 05 Oct 2012)

  Changed paths:
    M src/nci/libffi.c

  Log Message:
  -----------
  nci/libffi.c: check FLOATTYPE, not NUMVAL_SIZE

NUMVAL_SIZE is not good enough, esp. wrong for x86_64