configure.ac: library options to MAINLIBS
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.ac: library options to MAINLIBS
and static libruby, and append MAINLIBS to LIBRUBYARG_STATIC, as
these libraries are not needed for linking to shared libruby.
[ruby-core:85882] [Bug #14422]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e