Fix typos in src/ sub-directory #1154
                
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Found via
codespell -q 3 -S ./ChangeLog,./NEWS.txt -L aci,alph,ba,blok,childrens,childs,compiletime,currenty,doubleclick,dum,enew,inout,interaktive,lod,ontop,parm,propmt,prset,ro,seh,stil,supercedes,te,tesselation,tesselator,useg,valu,vas,widthout,xwindows