build

Fix self-reference in NA_MD_LOOP for Windows Ruby 3.4 / Fedra43 #60

Job	Run time
Build on ruby-head-debug (debug)	12s
fedora	37s
ubuntu ruby-2.7	40s
ubuntu ruby-2.6	40s
ubuntu ruby-3.1	12s
ubuntu ruby-3.0	11s
ubuntu ruby-head	11s
ubuntu ruby-3.3	13s
ubuntu ruby-3.4	9s
ubuntu ruby-3.2	15s
macos ruby-2.6	46s
macos ruby-3.1	11s
macos ruby-3.3	15s
windows ruby-2.6	2m 11s
macos ruby-3.0	12s
macos ruby-3.4	12s
windows ruby-2.7	2m 5s
windows ruby-3.0	1m 19s
macos ruby-3.2	12s
macos ruby-head	14s
windows ruby-head	1m 8s
macos ruby-2.7	43s
windows ruby-3.4	1m 5s
windows ruby-3.1	1m 4s
windows ruby-3.3	1m 29s
windows ruby-3.2	1m 12s
	17m 38s

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