lldb_4: fix w/gcc7

[dtzWill]

Same fix used in swift4, FWIW.

cc ZHF #36453

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[GrahamcOfBorg]

Success on aarch64-linux (full log)

Partial log (click to expand)

shrinking /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/bin/lldb-4.0.1
shrinking /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/bin/lldb-argdumper
shrinking /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/lib/liblldb.so.4.0.1
shrinking /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/lib/python2.7/site-packages/readline.so
gzipping man pages under /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/share/man/
strip is /nix/store/lvx1acn1ig1j2km8jds5x3ggh3f2wa8v-binutils-2.28.1/bin/strip
stripping (with command strip and flags -S) in /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/lib  /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1/bin
patching script interpreter paths in /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1
checking for references to /build in /nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1...
/nix/store/vfn629iq9h946lif592h7gq2h7j6a30v-lldb-4.0.1

[GrahamcOfBorg]

Success on x86_64-darwin (full log)

Partial log (click to expand)

/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1/lib/liblldb.4.0.1.dylib: fixing dylib
/nix/store/55jsvflmy5mw7r503fhmrpiiqqn8fwfp-lldb-4.0.1

[dtzWill]

x86_64-linux looks good, you can see log here: https://logs.nix.ci/?attempt_id=9af7b85b-ea79-458d-ba9d-c855eea0fdc4&key=nixos%2Fnixpkgs.36463