Add in a workaround to avoid host infection detection build failures
from the slang include directory in perf. I'll defer to Bruce to
fix this properly but we need a workaround now as this is breaking
builds.
(From OE-Core rev: 4fd4b2eafb5f4ff2ef85d7f5ff3238a41c34313b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
