File _link of Package perl-Convert-PEM

<link project="devel:languages:perl" package="perl-Convert-PEM">
<patches>
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  <!-- <apply name="patch" /> apply a patch on the source directory  -->
  <!-- <topadd>%define build_with_feature_x 1</topadd> add a line on the top (spec file only) -->
  <!-- <add>file.patch</add> add a patch to be applied after %setup (spec file only) -->
  <!-- <delete>filename</delete> delete a file -->
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</link>