sh: Add KEEP order to start.o section

The start.o section is changed by --gc-section option of ld.
Of this using KEEP order, therefore, evade this problem.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
3 files changed