commit 9101ce5800 (runc: pass -extldflags '-static' on when
BR2_STATIC_LIBS=y) contained a small copy/paste error, FLANNEL_GLDFLAGS was
used instead of RUNC_GLDFLAGS.
[Peter: refer to exact commit]
Signed-off-by: Fabrice Fontaine <fabrice.fontaine@orange.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>