Fix llvm::sys::fs::is_local on Hurd

[pinotree]

Summary

Use statfs() there too, ignoring a couple of known non-local
filesystems.

lib/Support/Unix/Path.inc

 
 // For GNU Hurd
 #if defined(__GNU__) && !defined(PATH_MAX)
 # define PATH_MAX 4096
 #endif
 
 #include <sys/types.h>
 #if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) &&   \
-    !defined(__linux__)
+    !defined(__linux__) && !defined(__GNU__)
 #include <sys/statvfs.h>
 #define STATVFS statvfs
 #define FSTATVFS fstatvfs
 #define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
 #else
 #if defined(__OpenBSD__) || defined(__FreeBSD__)
 #include <sys/param.h>
 #include <sys/mount.h>
 #elif defined(__linux__)
 #if defined(HAVE_LINUX_MAGIC_H)
 #include <linux/magic.h>
 #else
 #if defined(HAVE_LINUX_NFS_FS_H)
 #include <linux/nfs_fs.h>
 #endif
 #if defined(HAVE_LINUX_SMB_H)
 #include <linux/smb.h>
 #endif
 #endif
 #include <sys/vfs.h>
+#elif defined(__GNU__)
+#include <sys/vfs.h>
+#include <hurd/hurd_types.h>
 #else
 #include <sys/mount.h>
 #endif
 #define STATVFS statfs
 #define FSTATVFS fstatfs
 #define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
 #endif
 
#endif
   case CIFS_MAGIC_NUMBER:
     return false;
   default:
     return true;
   }
 #elif defined(__CYGWIN__)
   // Cygwin doesn't expose this information; would need to use Win32 API.
   return false;
+#elif defined(__GNU__)
+  switch (Vfs.f_type) {
+  case FSTYPE_NFS:
+  case FSTYPE_HTTP:
+    return false;
+  default:
+    return true;
+  }
 #else
   return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
 #endif
 }
 
 std::error_code is_local(const Twine &Path, bool &Result) {
   struct STATVFS Vfs;
   if (::STATVFS(Path.str().c_str(), &Vfs))