CI: Enable the verbose mode in the mkmf.rb. #694

Job	Run time
openssl-1.0.2u	3m 40s
openssl-1.1.0l	2m 41s
openssl-1.1.1t	2m 21s
openssl-3.0.8	4m 10s
libressl-3.1.5	2m 55s
libressl-3.2.7	3m 5s
libressl-3.3.6	3m 4s
libressl-3.4.3	3m 29s
libressl-3.5.3	3m 4s
libressl-3.6.1	3m 3s
libressl-3.7.0	3m 4s
openssl-3.0.8 fips	4m 26s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.6	58s
ubuntu-22.04 2.7	52s
ubuntu-22.04 3.0	1m 7s
ubuntu-22.04 3.1	1m 25s
ubuntu-22.04 3.2	1m 20s
ubuntu-22.04 head	1m 3s
ubuntu-22.04 truffleruby	1m 40s
ubuntu-22.04 truffleruby-head	1m 53s
ubuntu-20.04 2.6	1m 14s
ubuntu-20.04 2.7	55s
ubuntu-20.04 3.0	1m 25s
ubuntu-20.04 3.1	1m 19s
ubuntu-20.04 3.2	1m 16s
ubuntu-20.04 head	1m 19s
ubuntu-20.04 truffleruby-head	2m 0s
macos-latest 2.6	1m 44s
macos-latest 2.7	4m 3s
macos-latest 3.0	2m 18s
macos-latest 3.1	1m 24s
macos-latest 3.2	1m 20s
macos-latest head	1m 26s
macos-latest truffleruby-head	3m 57s
windows-latest 2.6	7m 39s
windows-latest 2.7	8m 55s
windows-latest 3.0	6m 8s
windows-latest 3.1	5m 32s
windows-latest 3.2	6m 18s
windows-latest ucrt	4m 36s
windows-latest mswin	3m 29s
	1h 57m 39s

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