Rakefile: recompile on .h changes #92

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-22.04 2.7	1m 13s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	33s
ubuntu-22.04 3.2	31s
ubuntu-22.04 3.3	34s
ubuntu-22.04 head	23s
ubuntu-22.04 jruby	32s
ubuntu-22.04 jruby-head	35s
macos-13 2.7	3m 20s
macos-13 3.0	53s
macos-13 3.1	36s
macos-13 3.2	33s
macos-13 3.3	43s
macos-13 head	31s
macos-13 jruby	55s
macos-13 jruby-head	37s
macos-14 2.7	1m 4s
macos-14 3.0	22s
macos-14 3.1	33s
macos-14 3.2	23s
macos-14 3.3	25s
macos-14 head	18s
macos-14 jruby	21s
macos-14 jruby-head	19s
windows-latest 2.7	3m 9s
windows-latest 3.0	1m 45s
windows-latest 3.1	2m 6s
windows-latest 3.2	2m 21s
windows-latest 3.3	1m 59s
windows-latest head	1m 3s
windows-latest mswin	41s
ubuntu-latest jruby-9.4	33s
macos-latest truffleruby-head	39s
ubuntu-latest truffleruby-head	1m 8s
	32m 12s

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