castxml: Fix build

[knedlsepp]

Motivation for this change

This should fix the castxml build.
Please backport to 18.09 (ZHF-18.09 #45961)

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option 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/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Fits CONTRIBUTING.md.

---

[GrahamcOfBorg]

Success on x86_64-darwin (full log)

Attempted: castxml

Partial log (click to expand)

-- Installing: /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/share/doc/castxml/LICENSE
-- Installing: /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/share/doc/castxml/NOTICE
-- Installing: /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/bin/castxml
-- Installing: /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/man/man1/castxml.1
post-installation fixup
moving /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/man to /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/share/man
gzipping man pages under /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/share/man/
strip is /nix/store/df6k4mgdjxciy0f637lryp7c9ln7n1m3-cctools-binutils-darwin/bin/strip
stripping (with command strip and flags -S) in /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403/bin
patching script interpreter paths in /nix/store/hm2nwkyy7z0bc003w1np07n1xhsnrl6a-CastXML-20180403

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: castxml

Partial log (click to expand)

-- Installing: /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/man/man1/castxml.1
post-installation fixup
moving /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/man to /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/share/man
shrinking RPATHs of ELF executables and libraries in /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403
shrinking /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/bin/castxml
gzipping man pages under /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/share/man/
strip is /nix/store/h0lbngpv6ln56hjj59i6l77vxq25flbz-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403/bin
patching script interpreter paths in /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403
checking for references to /build in /nix/store/7pwk6hmqv0jjdjbi8lvm10cfsc0apv80-CastXML-20180403...

[GrahamcOfBorg]

Success on aarch64-linux (full log)

Attempted: castxml

Partial log (click to expand)

-- Installing: /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/man/man1/castxml.1
post-installation fixup
moving /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/man to /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/share/man
shrinking RPATHs of ELF executables and libraries in /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403
shrinking /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/bin/castxml
gzipping man pages under /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/share/man/
strip is /nix/store/y4ymnvgxygpq05h03kyzbj572zmh6zla-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403/bin
patching script interpreter paths in /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403
checking for references to /build in /nix/store/b6l7sncv5cnj5ms4q9xdb1yky55r8ap5-CastXML-20180403...

[xeji]

backported: b682a40