test/openssl/test_asn1.rb: skip failing tests on LibreSSL 3.6.0

LibreSSL 3.6.0 expects the seconds part in UTCTime and GeneralizedTime
to be always present. LibreSSL 3.6.0 release note [1] says:

> - The ASN.1 time parser has been refactored and rewritten using CBS.
>   It has been made stricter in that it now enforces the rules from
>   RFC 5280.

[1] https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.6.0-relnotes.txt

Author: rhenium

test/openssl/test_asn1.rb

@@ -404,16 +404,17 @@ def test_set
   def test_utctime
     encode_decode_test B(%w{ 17 0D }) + "160908234339Z".b,
       OpenSSL::ASN1::UTCTime.new(Time.utc(2016, 9, 8, 23, 43, 39))
-    # Seconds is omitted
-    decode_test B(%w{ 17 0B }) + "1609082343Z".b,
-      OpenSSL::ASN1::UTCTime.new(Time.utc(2016, 9, 8, 23, 43, 0))
     begin
       # possible range of UTCTime is 1969-2068 currently
       encode_decode_test B(%w{ 17 0D }) + "690908234339Z".b,
         OpenSSL::ASN1::UTCTime.new(Time.utc(1969, 9, 8, 23, 43, 39))
     rescue OpenSSL::ASN1::ASN1Error
       pend "No negative time_t support?"
     end
+    # Seconds is omitted. LibreSSL 3.6.0 requires it
+    return if libressl?
+    decode_test B(%w{ 17 0B }) + "1609082343Z".b,
+      OpenSSL::ASN1::UTCTime.new(Time.utc(2016, 9, 8, 23, 43, 0))
     # not implemented
     # decode_test B(%w{ 17 11 }) + "500908234339+0930".b,
     #   OpenSSL::ASN1::UTCTime.new(Time.new(1950, 9, 8, 23, 43, 39, "+09:30"))
@@ -432,6 +433,8 @@ def test_generalizedtime
       OpenSSL::ASN1::GeneralizedTime.new(Time.utc(2016, 12, 8, 19, 34, 29))
     encode_decode_test B(%w{ 18 0F }) + "99990908234339Z".b,
       OpenSSL::ASN1::GeneralizedTime.new(Time.utc(9999, 9, 8, 23, 43, 39))
+    # LibreSSL 3.6.0 requires the seconds element
+    return if libressl?
     decode_test B(%w{ 18 0D }) + "201612081934Z".b,
       OpenSSL::ASN1::GeneralizedTime.new(Time.utc(2016, 12, 8, 19, 34, 0))
     # not implemented