libpng: forgot to update md5sum and shasum in bb
libpng: forgot to update md5sum and shasum in bb

nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,BlackPole/bp-openembedded,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,BlackPole/bp-openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,BlackPole/bp-openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111