[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

llvm-svn: 304412