Separate build target for rtc_base/numerics/safe_minmax.h

So that we can avoid dependency cycles.

Bug: none
Change-Id: I821d9f1319dff01403d6e4e310cbb2d4b2b125e8
Reviewed-on: https://webrtc-review.googlesource.com/60500
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22328}

logging/BUILD.gn

@@ -220,6 +220,7 @@ rtc_static_library("rtc_event_log_impl_base") {
     "../rtc_base:checks",
     "../rtc_base:rtc_base_approved",
     "../rtc_base:rtc_task_queue_api",
+    "../rtc_base:safe_minmax",
     "../rtc_base:sequenced_task_checker",
   ]