Makefile: remove redundant BUILDFLAGS
We don't set it, so there's no need to keep it.
@@ -22,7 +22,6 @@ ETCDIR ?= /etc
TMPFILESDIR ?= ${PREFIX}/lib/tmpfiles.d
SYSTEMDDIR ?= ${PREFIX}/lib/systemd/system
USERSYSTEMDDIR ?= ${PREFIX}/lib/systemd/user
-BUILDFLAGS ?=
BUILDTAGS ?= \
$(shell hack/apparmor_tag.sh) \
$(shell hack/btrfs_installed_tag.sh) \
