[Bug #20800] Move executable binary file path

From under "libexec", under `$(target)/bin` like as binutils.

Author: nobu

tool/mkrunnable.rb

@@ -34,7 +34,10 @@
 rubylibdir = config["rubylibdir"]
 rubyarchdir = config["rubyarchdir"]
 archdir = "#{extout}/#{arch}"
-exedir = libdirname == "archlibdir" ? "#{config["libexecdir"]}/#{arch}" : bindir
+exedir = bindir
+if libdirname == "archlibdir"
+  exedir = exedir.sub(%r[/\K(?=[^/]+\z)]) {extout+"/"}
+end
 [exedir, libdir, archdir].uniq.each do |dir|
   File.directory?(dir) or mkdir_p(dir)
 end

tool/rbinstall.rb

@@ -367,11 +367,7 @@ def CONFIG.[](name, mandatory = false)
 
 bindir = CONFIG["bindir", true]
 if CONFIG["libdirname"] == "archlibdir"
-  libexecdir = MAKEFILE_CONFIG["archlibdir"].dup
-  unless libexecdir.sub!(/\$\(lib\K(?=dir\))/) {"exec"}
-    libexecdir = "$(libexecdir)/$(arch)"
-  end
-  archbindir = RbConfig.expand(libexecdir)
+  archbindir = bindir.sub(%r[/\K(?=[^/]+\z)]) {CONFIG["target"] + "/"}
 end
 libdir = CONFIG[CONFIG.fetch("libdirname", "libdir"), true]
 rubyhdrdir = CONFIG["rubyhdrdir", true]