configure.in: no runtime path to -L
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40907 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: no runtime path to -L
runtime library directory if cross compiling, but only -R option.
runtime path makes no sense on the host system. [ruby-dev:47363]
[Bug #8443]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40907 b2dd03c8-39d4-4d8f-98ff-823fe69b080e