utils#system: improve verbose output.

This previously output the hilarious long and unnecessary LOAD_PATH.

Library/Homebrew/dev-cmd/ruby.rb

@@ -26,7 +26,7 @@ module Homebrew
     ruby_args.parse
 
     begin
-      safe_system ENV["HOMEBREW_RUBY_PATH"],
+      safe_system RUBY_PATH,
                   "-I", $LOAD_PATH.join(File::PATH_SEPARATOR),
                   "-rglobal", "-rdev-cmd/irb",
                   *ARGV

Library/Homebrew/utils.rb

@@ -35,7 +35,10 @@ module Homebrew
   end
 
   def system(cmd, *args, **options)
-    puts "#{cmd} #{args * " "}" if ARGV.verbose?
+    if ARGV.verbose?
+      puts "#{cmd} #{args * " "}".gsub(RUBY_PATH, "ruby")
+                                 .gsub($LOAD_PATH.join(File::PATH_SEPARATOR).to_s, "$LOAD_PATH")
+    end
     _system(cmd, *args, **options)
   end