CI: Enable the verbose mode in the mkmf.rb. #692

Job	Run time
openssl-1.0.2u	2m 53s
openssl-1.1.0l	2m 9s
openssl-1.1.1t	3m 4s
openssl-3.0.8	4m 8s
libressl-3.1.5	3m 36s
libressl-3.2.7	3m 21s
libressl-3.3.6	3m 5s
libressl-3.4.3	3m 53s
libressl-3.5.3	3m 6s
libressl-3.6.1	3m 55s
libressl-3.7.0	4m 10s
openssl-3.0.8 fips	4m 24s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.6	56s
ubuntu-22.04 2.7	53s
ubuntu-22.04 3.0	1m 13s
ubuntu-22.04 3.1	1m 12s
ubuntu-22.04 3.2	1m 6s
ubuntu-22.04 head	1m 16s
ubuntu-22.04 truffleruby	1m 43s
ubuntu-22.04 truffleruby-head	1m 49s
ubuntu-20.04 2.6	1m 14s
ubuntu-20.04 2.7	1m 9s
ubuntu-20.04 3.0	1m 18s
ubuntu-20.04 3.1	1m 26s
ubuntu-20.04 3.2	1m 5s
ubuntu-20.04 head	1m 1s
ubuntu-20.04 truffleruby-head	2m 28s
macos-latest 2.6	1m 34s
macos-latest 2.7	1m 17s
macos-latest 3.0	1m 30s
macos-latest 3.1	1m 27s
macos-latest 3.2	2m 1s
macos-latest head	1m 36s
macos-latest truffleruby-head	3m 56s
windows-latest 2.6	5m 49s
windows-latest 2.7	6m 10s
windows-latest 3.0	7m 44s
windows-latest 3.1	6m 41s
windows-latest 3.2	7m 37s
windows-latest ucrt	6m 29s
windows-latest mswin	4m 17s
	1h 59m 43s

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