Correctly set LDFLAGS and make grubby-bls expand all options variables
- Correctly set LDFLAGS to include hardened flags (pjones)
Related: rhbz#1654936
- grubby-bls: expand all variables in options field when updating it
Resolves: rhbz#1660700
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>