build old libpng version so that we can forcibly use it by specifying LD_LIBRARY_PATH in a binary software (like OpenOffice.org) that links to libpng12.so.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42318 20353a03-c40f-0410-a6d1-a30d3c3de9de