Check if OPENSSL_VERSION is defined in MiniSSL

For people who did not install from OpenSSL extension,

Here https://github.com/puma/puma/blob/91e57f4e173343746e122e8bb850b0244f508484/ext/puma_http11/mini_ssl.c#L12 is false, and they hit SSLError https://github.com/puma/puma/blob/91e57f4e173343746e122e8bb850b0244f508484/ext/puma_http11/mini_ssl.c#L555-L562

Check if the OPENSSL_VERSION is defined to fix this.

Co-Authored-By: Matthew Draper <matthew@trebex.net>
Co-Authored-By: Samuel Cochran <sj26@sj26.com>

lib/puma/minissl.rb

@@ -13,7 +13,7 @@ module MiniSSL
 
     # define constant at runtime, as it's easy to determine at built time,
     # but Puma could (it shouldn't) be loaded with an older OpenSSL version
-    HAS_TLS1_3 = !IS_JRUBY &&
+    HAS_TLS1_3 = !IS_JRUBY && const_defined?(OPENSSL_VERSION) &&
       (OPENSSL_VERSION[/ \d+\.\d+\.\d+/].split('.').map(&:to_i) <=> [1,1,1]) != -1 &&
       (OPENSSL_LIBRARY_VERSION[/ \d+\.\d+\.\d+/].split('.').map(&:to_i) <=> [1,1,1]) !=-1