Mark XS files as "type: programming"
Mark XS files as "type: programming"

I'd actually prefer to treat Perl XS files as C code, but this fix shouldn't be controversial.
nburkley/linguist,adamkaplan/linguist,kr/linguist,hcatlin/linguist,tschf/linguist,anhongyue/test222,mattn/linguist,pchaigno/linguist,ammaraskar/linguist,MahmoudFayed/linguist,sagar290/linguist,stanhu/linguist,assimovt/ling-ist,pchaigno/linguist,yscho/linguist,osorgin/linguist,erkyrath/linguist,ilyes14/linguist,seanders/linguist,JJ/linguist,meunierfrederic/octocatlinguist,phpsgi/linguist,stanhu/linguist,martynbm/linguist,jrnold/linguist,alitalia/linguist,stanhu/linguist,SRI-CSL/linguist,pcantrell/linguist,MadcapJake/linguist,scttnlsn/linguist,mattn/linguist,SRI-CSL/linguist,cybernet14/linguist,hcutler/linguist,christop/linguist,kyoungrok0517/linguist,R4PaSs/linguist,nburkley/linguist,davidzchen/linguist,github/linguist,cokeboL/linguist,chiranjeevjain/linguist,a0viedo/linguist,stanhu/linguist,sebgod/linguist,thejameskyle/linguist,jtbandes/linguist,R4PaSs/linguist,steventhanna/linguist,phpsgi/linguist,bluebear94/linguist,anhongyue/test222,mwpastore/linguist,matt40k/linguist,sebgod/linguist,ppaulweber/github-linguist,tschf/linguist,georgesuperman/linguist,georgesuperman/linguist,Mx7f/linguist,yyx990803/linguist,c-lipka/linguist,adamkaplan/linguist,CoderXpert/linguist,whitj00/linguist,a0viedo/linguist,mcandre/linguist,cokeboL/linguist,douglas-larocca/linguist,MadcapJake/linguist,yyx990803/linguist,erkyrath/linguist,c-lipka/linguist,ilyes14/linguist,thejameskyle/linguist,ya7lelkom/linguist,whitj00/linguist,christop/linguist,jjatria/linguist,pchaigno/linguist,hcatlin/linguist,douglas-larocca/linguist,manveru/linguist,scttnlsn/linguist,mwpastore/linguist,erkyrath/linguist,pcantrell/linguist,matt40k/linguist,jrnold/linguist,cybernet14/linguist,iblech/linguist,jjatria/linguist,osorgin/linguist,Mx7f/linguist,steventhanna/linguist,manveru/linguist,davidzchen/linguist,sebgod/linguist,alitalia/linguist,assimovt/ling-ist,PsichiX/linguist,iblech/linguist,yscho/linguist,github/linguist,MostAwesomeDude/linguist,sebgod/linguist,ammaraskar/linguist,yyx990803/linguist,ppaulweber/github-linguist,JJ/linguist,pchaigno/linguist,kyoungrok0517/linguist,MahmoudFayed/linguist,ya7lelkom/linguist,sagar290/linguist,kr/linguist,hcutler/linguist,CoderXpert/linguist,chiranjeevjain/linguist,BerkeleyTrue/linguist,CegepVictoriaville/linguist,jtbandes/linguist,FStarLang/linguist,MostAwesomeDude/linguist,BerkeleyTrue/linguist,github/linguist,github/linguist,seanders/linguist,bluebear94/linguist,meunierfrederic/octocatlinguist,CegepVictoriaville/linguist,mcandre/linguist,FStarLang/linguist,JJ/linguist,martynbm/linguist,PsichiX/linguist,yyx990803/linguist,JJ/linguist,erkyrath/linguist,meunierfrederic/octocatlinguist