[x86_64]: reuqire qemu-img to be installed (the one we have in tools is too old)

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40451 3c298f89-4303-0410-b956-a3cf2f4a3e73
[x86_64]: generate esxi compatible vmdks, too

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40452 3c298f89-4303-0410-b956-a3cf2f4a3e73