allow whitelisting runpath entries

[msarahan]

GCC is currently failing to build because of

ERROR (gcc_impl_linux-64,x86_64-conda_cos6-linux-gnu/sysroot/lib/librt-2.12.2.so): runpaths ['$ORIGIN/../../../lib/'] found in /opt/conda/conda-bld/compilers_linux-64_1533843820745/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac/x86_64-conda_cos6-linux-gnu/sysroot/lib/librt-2.12.2.so

@mingwandroid is very hesitant to monkey with any of this stuff, as GCC handles it own relocatability stuff. This PR allows us to whitelist runpath stuff and avoid this error.

[github-actions]

Hi there, thank you for your contribution!

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Please open a new issue or pull request if needed.

Thanks!