libelf: Return error if elf_compress_gnu is used on SHF_COMPRESSED section.

libelf: Return error if elf_compress_gnu is used on SHF_COMPRESSED section.

Compressing a section that is already compressed is fine, but useless.
But it isn't possible to gnu compress (or decompress) a SHF_COMPRESSED
section since there is no state kept that would tell if the section was
first GNU compressed or first gabi compressed. Calling elf_compress_gnu
on a section and then calling elf_compress on it to decompress it twice
could cause a crash (the other way around is fine). Just disallow it.

https://sourceware.org/bugzilla/show_bug.cgi?id=23528

Signed-off-by: Mark Wielaard <mark@klomp.org>