Merge tag 'jdk-21-ga' of https://github.com/openjdk/jdk into jdk-20

.azure/Makefile

@@ -0,0 +1,16 @@
+all default: azure-pipelines.yml
+
+%: %.m4 defs.m4
+	@chmod -f +w $@ || true
+	m4 $< > $@
+# Squeeze multiple blank lines into one.
+	cat -s $@ > [email protected]
+# Remove leading blank lines.
+	sed '/[^[:blank:]]/,$$!d' [email protected] > $@
+# Remove trailing blank lines.
+	sed -e :a -e '/^\s*$$/{$$d;N;ba' -e '}' $@ > [email protected]
+	mv -f [email protected] $@
+	@chmod -w $@
+
+clean:
+	rm -f azure-pipelines.yml