Explicitly look for openssl@1.1 with Homebrew on macOS

* Some users have "openssl" still linking to the older OpenSSL 1.0.2.
* OpenSSL 1.0.2 is end of life, so it should no longer be used.
* Still try the older 'openssl' for compatibility.
* Look in $(brew --prefix)/opt rather than `brew --prefix $FORMULA` as
  that can miss an installed openssl under /usr/local/opt/openssl due to
  Homebrew having updating the openssl formula to resolve to openssl@1.1.

(cherry picked from commit df77b98)

Author: eregon

lib/truffle/truffle/openssl-prefix.rb

@@ -13,9 +13,15 @@
 macOS = RbConfig::CONFIG['host_os'].include?('darwin')
 
 if macOS && !ENV['OPENSSL_PREFIX']
-  homebrew_prefix = `brew --prefix openssl 2>/dev/null`.chomp
-  if $?.success? and Dir.exist?(homebrew_prefix) # Homebrew
-    ENV['OPENSSL_PREFIX'] = homebrew_prefix
+  homebrew = `brew --prefix 2>/dev/null`.strip
+  unless $?.success? and !homebrew.empty? and Dir.exist?(homebrew)
+    homebrew = nil
+  end
+
+  if homebrew and prefix = "#{homebrew}/opt/openssl@1.1" and Dir.exist?(prefix)
+    ENV['OPENSSL_PREFIX'] = prefix
+  elsif homebrew and prefix = "#{homebrew}/opt/openssl" and Dir.exist?(prefix)
+    ENV['OPENSSL_PREFIX'] = prefix
   elsif Dir.exist?('/opt/local/include/openssl') # MacPorts
     ENV['OPENSSL_PREFIX'] = '/opt/local'
   else