[PATCH] Support 'exclude' in objcopy --set-section-flags

[Fangrui Song via binutils]

https://sourceware.org/bugzilla/show_bug.cgi?id=25371

commit 18ae9cc1db45e2e7f6467b91d8abbc5eb45fbaa5 makes SHF_EXCLUDE
generic, not like other SHF_MASKPROC flags. So we do not preserve
SHF_EXCLUDE when setting sh_flags.

--set-section-flags .foo= => clear SHF_EXCLUDE
--set-section-flags .foo=exclude => set SHF_EXCLUDE
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