examples: fix install with empty meson parameter

examples: fix install with empty meson parameter

While the examples were being installed into the appropriate install path
when processing the examples/meson.build file, that file was only processed
if the "examples" meson parameter was non-empty. Since we now do more than
just build the examples, we need to unconditionally process the file.

Fixes: 2daf565f91b5 ("examples: install as part of ninja install")
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Luca Boccassi <bluca@debian.org>