linux/sigret_addr: support Gentoo Hardened
linux/sigret_addr: support Gentoo Hardened

Gentoo Hardened' libc does not have symbols and its PT_DYNAMIC header
does not have a PT_HASH field. Find an other way to compute the length
of the dynamic symbol table.

fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared