add glibc_workaround.cpp if option is chosen
add glibc_workaround.cpp if option is chosen

This reverts commit 751d9bff1672f6b8cbd2b5ebe2eb460223746806.

lightmare/mapnik,mapnik/mapnik,tomhughes/mapnik,naturalatlas/mapnik,naturalatlas/mapnik,lightmare/mapnik,mapnik/mapnik,lightmare/mapnik,mapnik/mapnik,naturalatlas/mapnik,tomhughes/mapnik,tomhughes/mapnik,lightmare/mapnik,tomhughes/mapnik,mapnik/mapnik,naturalatlas/mapnik