Ensure LDFLAGS is passed to CC not LD.

If we build with something like:
make LDFLAGS="-Wl,-Bsymbolic-functions"

We'll get an error because the LDFLAGS are being passed to LD when they
should be pased to CC.

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>