[Solaris] Fix PR33228 - llvm::sys::fs::is_local_impl done right

[Solaris] Fix PR33228 - llvm::sys::fs::is_local_impl done right

Summary:
Solaris-specific implementation for llvm::sys::fs::is_local_impl.
FStype pattern matching might be a bit unreliable, but at least it fixes the build failure.

Reviewers: mgorny, nlopes, llvm-commits, krytarowski

Reviewed By: krytarowski

Subscribers: voskresensky.vladimir, krytarowski

Differential Revision: https://reviews.llvm.org/D33695

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304412 91177308-0d34-0410-b5e6-96231b3b80d8