scripts: Update the gcc-wrapper white list for 4.13 release

Update the white list of warnings for the latest kernel release
4.13, which are being treated as errors while compiling kernel
with clang compiler.

Change-Id: I926193e8db1b511f1e5e74fe91c3341786feb472
Signed-off-by: Runmin Wang <runminw@codeaurora.org>