Enable somewhat more debug output in the CI

Author: larskanis

test/rcd_test/Rakefile

@@ -46,7 +46,7 @@ namespace "gem" do
         RakeCompilerDock.sh <<-EOT, platform: plat, mountdir: Dir.pwd + "/../.."
           (cp tmp/gem/gem-*.pem ~/.gem/ || true) &&
           bundle --local &&
-          rake native:#{plat} pkg/#{exttask.gem_spec.full_name}-#{plat}.gem #{config}
+          rake native:#{plat} pkg/#{exttask.gem_spec.full_name}-#{plat}.gem "MAKE=make V=1" #{config}
         EOT
       end
     end

test/rcd_test/ext/mri/extconf.rb

@@ -11,9 +11,11 @@
   puts "-"*70
   puts "CONFIG['arch']: #{CONFIG['arch'].inspect}"
   puts "CONFIG['sitearch']: #{CONFIG['sitearch'].inspect}"
+  puts "CONFIG['host']: #{CONFIG['host'].inspect}"
   puts "CONFIG['RUBY_SO_NAME']: #{CONFIG['RUBY_SO_NAME'].inspect}"
   puts "RUBY_PLATFORM: #{RUBY_PLATFORM.inspect}"
   puts "Gem::Platform.local.to_s: #{Gem::Platform.local.to_s.inspect}"
+  puts "cc --version: #{ %x[#{CONFIG['CC']} --version].lines.first}"
   puts "-"*70
 
   have_func('rb_thread_call_without_gvl', 'ruby/thread.h') ||