CI: Enable the verbose mode in the mkmf.rb. #688

Job	Run time
openssl-1.0.2u	2m 23s
openssl-1.1.0l	2m 17s
openssl-1.1.1t	2m 17s
openssl-3.0.8	2m 23s
libressl-3.1.5	2m 58s
libressl-3.2.7	3m 3s
libressl-3.3.6	3m 55s
libressl-3.4.3	2m 58s
libressl-3.5.3	3m 43s
libressl-3.6.1	3m 55s
libressl-3.7.0	3m 7s
openssl-3.0.8 fips	2m 17s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.6	1m 31s
ubuntu-22.04 2.7	1m 6s
ubuntu-22.04 3.0	1m 3s
ubuntu-22.04 3.1	1m 20s
ubuntu-22.04 3.2	1m 18s
ubuntu-22.04 head	1m 5s
ubuntu-22.04 truffleruby	1m 59s
ubuntu-22.04 truffleruby-head	1m 58s
ubuntu-20.04 2.6	1m 13s
ubuntu-20.04 2.7	1m 8s
ubuntu-20.04 3.0	1m 5s
ubuntu-20.04 3.1	1m 3s
ubuntu-20.04 3.2	1m 12s
ubuntu-20.04 head	1m 1s
ubuntu-20.04 truffleruby-head	2m 6s
macos-latest 2.6	2m 3s
macos-latest 2.7	1m 53s
macos-latest 3.0	1m 24s
macos-latest 3.1	1m 20s
macos-latest 3.2	1m 42s
macos-latest head	1m 18s
macos-latest truffleruby-head	4m 15s
windows-latest 2.6	8m 42s
windows-latest 2.7	8m 34s
windows-latest 3.0	7m 57s
windows-latest 3.1	5m 59s
windows-latest 3.2	4m 46s
windows-latest ucrt	4m 20s
windows-latest mswin	3m 32s
	1h 53m 12s

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