cover: Use native coverage if supported #3053

Job	Run time
Event File	4s
Build Erlang/OTP (64-bit)	24m 19s
Build Erlang/OTP (iOS)	6m 32s
Build Erlang/OTP (32-bit)	12m 55s
Build Erlang/OTP (macOS)	9m 57s
Build Erlang/OTP (cross-compile)	19m 30s
Build Erlang/OTP (Types and Flavors)	12m 22s
Build Erlang/OTP (clang)	8m 46s
Build Erlang/OTP (Windows)	18m 53s
Build and check documentation	5m 56s
Run static analysis	6m 49s
Test Erlang/OTP (emulator)	45m 41s
Test Erlang/OTP (debug)	6m 19s
Test Erlang/OTP (compiler)	16m 57s
Test Erlang/OTP (kernel)	1h 4m 31s
Test Erlang/OTP (stdlib)	34m 52s
Test Erlang/OTP (tools)	7m 32s
Release Erlang/OTP	0s
Test Erlang/OTP (system)	10m 4s
	5h 11m 59s

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