Fix remaining "windows" references reg. fat binary gems

Rakefile

@@ -65,14 +65,14 @@ Rake::ExtensionTask.new do |ext|
 	ext.cross_config_options += CrossLibraries.map do |xlib|
 		{
 			xlib.platform => [
-				"--enable-windows-cross",
+				"--enable-cross-build",
 				"--with-openssl-platform=#{xlib.openssl_config}",
 				"--with-toolchain=#{xlib.toolchain}",
 			]
 		}
 	end
 
-	# Add libpq.dll to windows binary gemspec
+	# Add libpq.dll/.so to fat binary gemspecs
 	ext.cross_compiling do |spec|
 		spec.files << "ports/#{spec.platform.to_s}/lib/libpq.so.5" if spec.platform.to_s =~ /linux/
 		spec.files << "ports/#{spec.platform.to_s}/lib/libpq.dll" if spec.platform.to_s =~ /mingw|mswin/

ext/extconf.rb

@@ -23,7 +23,7 @@
 	$stderr.puts "Calling libpq with GVL locked"
 end
 
-if enable_config("windows-cross")
+if enable_config("cross-build")
 	gem 'mini_portile2', '~>2.1'
 	require 'mini_portile2'