configure.in: compress debug sections
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56445 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: compress debug sections
if available, which reduces the size of LIBRUBY_SO by half or
more.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56445 b2dd03c8-39d4-4d8f-98ff-823fe69b080e