digest: always run SHA-3 and truncated SHA-2 tests

The "pend" are no longer necessary, as they work with all OpenSSL
variants we currently support. They were added in OpenSSL 1.1.1 and
LibreSSL 3.8.0. They are also supported by the current AWS-LC release.

This makes the SHA-3 tests run with AWS-LC correctly. AWS-LC does not
report SHA-3 in OpenSSL::Digest.digests.

test/openssl/test_digest.rb

@@ -88,7 +88,6 @@ def test_sha2
   end
 
   def test_sha512_truncate
-    pend "SHA512_224 is not implemented" unless digest_available?('sha512-224')
     sha512_224_a = "d5cdb9ccc769a5121d4175f2bfdd13d6310e0d3d361ea75d82108327"
     sha512_256_a = "455e518824bc0601f9fb858ff5c37d417d67c2f8e0df2babe4808858aea830f8"
 
@@ -100,7 +99,6 @@ def test_sha512_truncate
   end
 
   def test_sha3
-    pend "SHA3 is not implemented" unless digest_available?('sha3-224')
     s224 = '6b4e03423667dbb73b6e15454f0eb1abd4597f9a1b078e3f5b5a6bc7'
     s256 = 'a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a'
     s384 = '0c63a75b845e4f7d01107d852e4c2485c51a50aaaa94fc61995e71bbee983a2ac3713831264adb47fb6bd1e058d5f004'
@@ -145,11 +143,6 @@ def check_digest(oid)
     d = OpenSSL::Digest.new(oid.oid)
     assert_not_nil(d)
   end
-
-  def digest_available?(name)
-    @digests ||= OpenSSL::Digest.digests
-    @digests.include?(name)
-  end
 end
 
 end