[tools] mkimage: fix md5sum after r37361

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37366 3c298f89-4303-0410-b956-a3cf2f4a3e73
Config.in: fix depends syntax

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37367 3c298f89-4303-0410-b956-a3cf2f4a3e73
tools/mkimage: avoid a linux specific return code

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37368 3c298f89-4303-0410-b956-a3cf2f4a3e73