buildroot

package: remove trailing backslash

Occurrences were searched using [1]:
check-package --include-only TrailingBackslash $(find * -type f)
and manually removed.

[1] http://patchwork.ozlabs.org/patch/729669/

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>