scripts: Update the gcc-wrapper white list for 4.12.rc4 release

Update the white list of warnings for the latest kernel
release 4.12.rc4, which are being treated as errors while
compiling Kernel with clang compiler.

Change-Id: I88d98846cac9d0ffa065cc8c8f14af0059c8b55b
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>