internal/reflectlite: skip TestMirrorWithReflect reflect package source is unavailable
internal/reflectlite: skip TestMirrorWithReflect reflect package source is unavailable

Fixes #34847

Change-Id: Ibb58c8820cdab8b9f3755fcfba754ad0c9ca982f
Reviewed-on: https://go-review.googlesource.com/c/go/+/200657
Run-TryBot: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Elias Naur <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@eliasnaur.com>

golang/go,cloudflare/go,nawawi/go,golang/go,akutz/go,akutz/go,CAFxX/go,CAFxX/go,CAFxX/go,cloudflare/go,cloudflare/go,golang/go,nawawi/go,CAFxX/go,golang/go,akutz/go,cloudflare/go,golang/go,CAFxX/go,golang/go,nawawi/go,cloudflare/go,nawawi/go,akutz/go,CAFxX/go,cloudflare/go,nawawi/go,akutz/go,CAFxX/go,cloudflare/go,golang/go,akutz/go,cloudflare/go,nawawi/go,golang/go,akutz/go,nawawi/go,CAFxX/go,akutz/go,nawawi/go