vm_insnhelper.c: suppress warning

* vm_insnhelper.c (vm_callee_setup_keyword_arg): suppress
  -Wsign-compare warning.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40955 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rbinstall.rb: reject empty files

* tool/rbinstall.rb (install_recursive): add maxdepth option.
* tool/rbinstall.rb (bin-comm): limit depth of bindir and reject empty
  files.  [ruby-core:55101] [Bug #8432]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40956 b2dd03c8-39d4-4d8f-98ff-823fe69b080e