build: skip dockit on IBMi

PR-URL: #62189
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Abdirahim Musse <abdirahim.musse@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: sravani1510

Makefile

@@ -838,6 +838,10 @@ out/doc/api: doc/api
 # Using grouped targets (&:) so Make knows one command produces all outputs
 ifeq ($(OSTYPE),aix)
 # TODO(@nodejs/web-infra): AIX is currently hanging during HTML minification
+$(apidocs_html) $(apidocs_json) out/doc/api/all.html out/doc/api/all.json:
+	@echo "Skipping $@ (not currently supported by $(OSTYPE) machines)"
+else ifeq ($(OSTYPE),os400)
+# TODO(@nodejs/web-infra): IBMi is currently hanging during HTML minification
 $(apidocs_html) $(apidocs_json) out/doc/api/all.html out/doc/api/all.json:
 	@echo "Skipping $@ (not currently supported by $(OSTYPE) machines)"
 else