[flang-commits] [flang] [llvm] [flang/flang-rt] Add -isysroot flag only to tests really requiring (PR #152914)

[Leandro Lupori via flang-commits]

https://github.com/luporl approved this pull request.

Except for @tarunprabhu's comments, LGTM, thanks.

https://github.com/llvm/llvm-project/pull/152914