[compat] implement OpenSSL::PKey#compare? #303

Job	Run time
maven-test (jruby-9.4.14.0, 11, temurin)	2m 15s
maven-test (jruby-9.4.14.0, 25, temurin)	2m 1s
maven-test (21, oracle, jruby-9.4.8.0)	2m 32s
maven-test (11, temurin, jruby-9.2.20.1)	2m 41s
maven-test (8, temurin, jruby-9.2.19.0)	2m 43s
maven-test (jruby-9.4.14.0, 21, temurin)	2m 14s
maven-test (jruby-9.4.14.0, 8, temurin)	2m 22s
maven-test (8, temurin, jruby-9.3.3.0)	2m 30s
maven-test (21, corretto, jruby-head)	2m 31s
maven-test (21, temurin, jruby-10.0.4.0)	2m 10s
maven-test (25, temurin, jruby-10.0.3.0)	2m 28s
maven-test (11, zulu, jruby-9.4.5.0)	2m 36s
maven-test (24, zulu, jruby-10.0.1.0)	2m 22s
maven-test (11, temurin, jruby-9.3.13.0)	2m 14s
maven-test (21, oracle, jruby-9.3.13.0)	2m 33s
	36m 12s

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