cmuses configure checks an absolute path for the existence of a kernel
header. This results in a check against the hosts version of
/usr/include/sys/soundcard.h, which potentially does not exists (at
least on my system).
This patch supersedes http://patchwork.openwrt.org/patch/2713/.
Signed-off-by: Mathias Kresin <openwrt@kresin.me>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@39417 3c298f89-4303-0410-b956-a3cf2f4a3e73
