New comment by lane-brain on void-packages repository

https://github.com/void-linux/void-packages/pull/28785#issuecomment-781563989

Comment:
@ericonr changing the _target_triplet to XBPS_TARGET_TRIPLET produces a regression, it appears that it's not defined even in the template header, leading to bad install paths for the libgccjit headers. if the case section defining the triplets is too unsightly, I can alternatively refactor the template to use the original make install script and cut away the extraneous files. for now, I've amended my commit to a working build template that fixes the regression