[clang] [Driver] Make use of AddFilePathLibArgs() on NetBSD. (PR #71371)

[Fangrui Song via cfe-commits]

================
@@ -461,3 +461,8 @@
 // DRIVER-PASS-INCLUDES:      "-cc1" {{.*}}"-resource-dir" "[[RESOURCE:[^"]+]]"
 // DRIVER-PASS-INCLUDES-SAME: "-internal-isystem" "[[RESOURCE]]{{/|\\\\}}include"
 // DRIVER-PASS-INCLUDES-SAME: {{^}} "-internal-externc-isystem" "{{.*}}/usr/include"
+
+// Check that the driver passes the system library path.
----------------
MaskRay wrote:

This file is very long and can be better organized. I think you can reuse an existing RUN line.

If cmake `DEFAULT_SYSROOT` is set, there may not be a  `-L/usr/lib`. You need to set `--sysroot=` to test a usr/lib directory

https://github.com/llvm/llvm-project/pull/71371