Now that the 3.8 kernel has been released we can bump the libc-headers
to that version and remove the 3.7 variant. Userspace compatibility is
maintained through kernel versions, we also make the single 3.8 version
the toolchain default.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
