CI: Enable the verbose mode in the mkmf.rb. #693

Job	Run time
openssl-1.0.2u	3m 49s
openssl-1.1.0l	2m 57s
openssl-1.1.1t	2m 19s
openssl-3.0.8	4m 18s
libressl-3.1.5	2m 53s
libressl-3.2.7	3m 38s
libressl-3.3.6	2m 57s
libressl-3.4.3	3m 5s
libressl-3.5.3	3m 45s
libressl-3.6.1	3m 47s
libressl-3.7.0	4m 16s
openssl-3.0.8 fips	5m 48s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.6	58s
ubuntu-22.04 2.7	1m 3s
ubuntu-22.04 3.0	1m 10s
ubuntu-22.04 3.1	1m 17s
ubuntu-22.04 3.2	1m 21s
ubuntu-22.04 head	1m 4s
ubuntu-22.04 truffleruby	1m 40s
ubuntu-22.04 truffleruby-head	2m 23s
ubuntu-20.04 2.6	1m 12s
ubuntu-20.04 2.7	54s
ubuntu-20.04 3.0	1m 12s
ubuntu-20.04 3.1	1m 8s
ubuntu-20.04 3.2	1m 17s
ubuntu-20.04 head	1m 14s
ubuntu-20.04 truffleruby-head	2m 57s
macos-latest 2.6	3m 11s
macos-latest 2.7	1m 40s
macos-latest 3.0	1m 40s
macos-latest 3.1	1m 39s
macos-latest 3.2	1m 28s
macos-latest head	1m 24s
macos-latest truffleruby-head	3m 56s
windows-latest 2.6	7m 11s
windows-latest 2.7	5m 55s
windows-latest 3.0	6m 32s
windows-latest 3.1	5m 47s
windows-latest 3.2	5m 31s
windows-latest ucrt	4m 55s
windows-latest mswin	3m 17s
	1h 58m 30s

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