addr2line.c: Don't special-case DWARF 5 parsing with GCC

While trying to fix YJIT's symbol hygiene issue over at GH-7115, I found
that addr2line.c's DWARF 5 parsing is half-disabled when building with
GCC. Rust's output contains some DW_AT_rnglists_base records, which the
disabled code reads. Without DW_AT_rnglists_base, it crashes when
generating a backtrace.

In common Ruby build configurations, GCC opts to only use
DW_FORM_sec_offset for the range lists, and so it doesn't generate
DW_AT_rnglists_base records, so consuming GCC's DWARF 5 while building
with GCC was not a problem.

However, even when building with GCC, we might need to parse DWARF 5
generated by other compilers at runtime. They could come from C
extensions built by Clang, or come from Rust extensions. This
can happen even when building without YJIT.

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