bitbake.conf: Weakly assign DL_DIR so it can be set from the environment (from poky)
bitbake.conf: Weakly assign DL_DIR so it can be set from the environment (from poky)

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oe-mirror,crystalfontz/openembedded,dellysunnymtech/sakoman-oe,nlebedenco/mini2440,SIFTeam/openembedded,xifengchuo/openembedded,dellysunnymtech/sakoman-oe,John-NY/overo-oe,openembedded/openembedded,dave-billin/overo-ui-moos-auv,JamesAng/goe,demsey/openembedded,JamesAng/goe,BlackPole/bp-openembedded,yyli/overo-oe,rascalmicro/openembedded-rascal,xifengchuo/openembedded,dellysunnymtech/sakoman-oe,openembedded/openembedded,trini/openembedded,dellysunnymtech/sakoman-oe,John-NY/overo-oe,sutajiokousagi/openembedded,trini/openembedded,demsey/openenigma2,giobauermeister/openembedded,John-NY/overo-oe,dave-billin/overo-ui-moos-auv,sentient-energy/emsw-oe-mirror,nx111/openembeded_openpli2.1_nx111,JamesAng/goe,KDAB/OpenEmbedded-Archos,trini/openembedded,dave-billin/overo-ui-moos-auv,anguslees/openembedded-android,BlackPole/bp-openembedded,KDAB/OpenEmbedded-Archos,mrchapp/arago-oe-dev,openpli-arm/openembedded,scottellis/overo-oe,sampov2/audio-openembedded,trini/openembedded,nvl1109/openembeded,John-NY/overo-oe,JamesAng/oe,openpli-arm/openembedded,JamesAng/goe,popazerty/openembedded-cuberevo,sledz/oe,bticino/openembedded,BlackPole/bp-openembedded,JrCs/opendreambox,trini/openembedded,buglabs/oe-buglabs,yyli/overo-oe,Martix/Eonos,troth/oe-ts7xxx,anguslees/openembedded-android,giobauermeister/openembedded,philb/pbcl-oe-2010,scottellis/overo-oe,nzjrs/overo-openembedded,xifengchuo/openembedded,demsey/openenigma2,thebohemian/openembedded,troth/oe-ts7xxx,demsey/openembedded,JrCs/opendreambox,troth/oe-ts7xxx,openpli-arm/openembedded,openembedded/openembedded,libo/openembedded,nlebedenco/mini2440,scottellis/overo-oe,SIFTeam/openembedded,Martix/Eonos,bticino/openembedded