Use SHF_COMPRESSED before looking for ZLIB sig
Use SHF_COMPRESSED before looking for ZLIB sig

Prefer the stronger signal of having a flag, to a signature in a section
name when deciding to decompress it. We use the heuristic of the "ZLIB"
signature, and the name starting with ".zdebug_" for the "legacy" version

peadar/pstack,peadar/pstack,peadar/pstack,peadar/pstack