[FileSpec] Make style argument mandatory for SetFile. NFC

Fix SetFile uses in hosts that I missed in r334663.

llvm-svn: 334664
diff --git a/lldb/source/Host/linux/HostInfoLinux.cpp b/lldb/source/Host/linux/HostInfoLinux.cpp
index 4df14cf..4983947 100644
--- a/lldb/source/Host/linux/HostInfoLinux.cpp
+++ b/lldb/source/Host/linux/HostInfoLinux.cpp
@@ -187,7 +187,7 @@
     ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path) - 1);
     if (len > 0) {
       exe_path[len] = 0;
-      g_program_filespec.SetFile(exe_path, false);
+      g_program_filespec.SetFile(exe_path, false, FileSpec::Style::native);
     }
   }