Fix skb_snprintf uint64 parsing for the Pandaboard.

Make sure we parse 8 bytes instead of 4.

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>

Added functionality in libskb to store and retrieve caps.

This uses a custom scanf and snprintf implementation
that has an additional format specifier (%Q) to
transparently load and store caps from and in the SKB.

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>