openssl: fix broken openssl check

* ext/openssl/extconf.rb: check for broken OpenSSL only on mac OS.
  [ruby-core:79475] [Bug #13200]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/openssl/extconf.rb

@@ -60,7 +60,7 @@ unless result
   raise "OpenSSL 0.9.8 or later required."
 end
 
-unless OpenSSL.check_func("SSL_library_init()", "openssl/ssl.h")
+if /darwin/ =~ RUBY_PLATFORM and !OpenSSL.check_func("SSL_library_init()", "openssl/ssl.h")
   raise "Ignore OpenSSL broken by Apple.\nPlease use another openssl. (e.g. using `configure --with-openssl-dir=/path/to/openssl')"
 end