package/racehound: bump and fix dependencies

package/racehound: bump and fix dependencies

As pointed out by Arnout, racehound does not require kernel headers
3.14-or-later. So, drop this depenency.

It stills require a kernel >= 3.14 to build and run, but we really
have no way to express that dependency as Kconfig options.

Besides, racehound does not build with kernel 4.5 because the struct
modules has been updated. Bump racehound to fix that build failure.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>