Use the subdir-objects option.

./autogen.sh --enable-strict-flags --enable-gtk-doc --enable-gir-doc \
    --prefix=/usr

complained about a possible forward incompatibility since we weren't
using the subdir-objects option. Using the option eliminates the
warnings.

[endlessm/eos-sdk#1513]
Correct error message.

eos-metrics-select-env is not a thing. The correct command is
eos-select-metrics-env. Also, "dev" was accidentally omitted, and many
of the lines exceeded 80 columns.

[endlessm/eos-sdk#1513]
Remove smoke program.

[endlessm/eos-sdk#1513]
Merge pull request #6 from endlessm/sdk/1513

Correct error message and remove smoke program.

[endlessm/eos-sdk#1513]