Let Makefile use LDFLAGS

As suggested in #1.

Idea-by: Paolo Montrasio <paolo@paolomontrasio.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Don't output larger files

Fixes #2.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>