[compiler-rt] [compiler-rt] fseek interception update. (PR #122795)

[Rainer Orth via llvm-commits]

rorth wrote:

This patch broke the [Solaris/sparcv9](https://lab.llvm.org/buildbot/#/builders/13/builds/4725) and [Solaris/amd64](https://lab.llvm.org/staging/#/builders/120/builds/5100) buildbots.

https://github.com/llvm/llvm-project/pull/122795