Always distribute extras/ezio/ezio3.ti.

Always distribute extras/ezio/ezio3.ti.

I had thought that Automake was smart enough to ignore conditionals around
EXTRA_DIST, so that all files always got distributed regardless of whether
Automake conditionals were set.  I was wrong.

This pushes the conditionals for building the ezio binaries down into
extras/ezio/automake.mk and thereby makes adding ezio3.ti to EXTRA_DIST
unconditional, so that it always gets distributed.  Otherwise, this file
will not be distributed on systems that don't have curses or don't have
PCRE, which is very surprising.