x86/boot/compressed: Add missing debugging sections to output

Include the missing DWARF and STABS sections in the compressed image,
when they are present.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200821194310.3089815-29-keescook@chromium.org