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prelude.c.tmpl: get rid of errors with old gcc

• template/prelude.c.tmpl: moved diagnostic pragmas outside
  prelude_eval() for very old gcc. [ruby-core:84449] [Bug #14234]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61478 b2dd03c8-39d4-4d8f-98ff-823fe69b080e