tuxmath: removed old 1.6.0 version that never properly worked
tuxmath: removed old 1.6.0 version that never properly worked

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abs/oe-buglabs,hulifox008/openembedded,KDAB/OpenEmbedded-Archos,openpli-arm/openembedded,JrCs/opendreambox,YtvwlD/od-oe,JamesAng/goe,YtvwlD/od-oe,BlackPole/bp-openembedded,troth/oe-ts7xxx,openembedded/openembedded,YtvwlD/od-oe,libo/openembedded,JrCs/opendreambox,sledz/oe,JamesAng/oe,thebohemian/openembedded,JrCs/opendreambox,openpli-arm/openembedded,nvl1109/openembeded,sampov2/audio-openembedded,demsey/openenigma2,SIFTeam/openembedded,sentient-energy/emsw-oe-mirror,crystalfontz/openembedded,John-NY/overo-oe,JamesAng/goe,buglabs/oe-buglabs,giobauermeister/openembedded,demsey/openembedded,nlebedenco/mini2440,popazerty/openembedded-cuberevo,sampov2/audio-openembedded,yyli/overo-oe,philb/pbcl-oe-2010,popazerty/openembedded-cuberevo,sutajiokousagi/openembedded,anguslees/openembedded-android,scottellis/overo-oe,buglabs/oe-buglabs,nvl1109/openembeded,sutajiokousagi/openembedded,yyli/overo-oe,sentient-energy/emsw-oe-mirror,philb/pbcl-oe-2010,JamesAng/goe,xifengchuo/openembedded,nzjrs/overo-openembedded,popazerty/openembedded-cuberevo,crystalfontz/openembedded,sledz/oe,KDAB/OpenEmbedded-Archos,nzjrs/overo-openembedded,nx111/openembeded_openpli2.1_nx111,hulifox008/openembedded,nlebedenco/mini2440,scottellis/overo-oe,scottellis/overo-oe,demsey/openembedded,dellysunnymtech/sakoman-oe,Martix/Eonos,giobauermeister/openembedded,crystalfontz/openembedded,giobauermeister/openembedded,Martix/Eonos,dave-billin/overo-ui-moos-auv,libo/openembedded,philb/pbcl-oe-2010,demsey/openembedded,SIFTeam/openembedded,trini/openembedded,BlackPole/bp-openembedded,demsey/openenigma2,nzjrs/overo-openembedded,nvl1109/openembeded,dave-billin/overo-ui-moos-auv,thebohemian/openembedded