Add in C locale env vars for doc build
Add in C locale env vars for doc build

larrybradley/astropy,bsipocz/astropy,MSeifert04/astropy,StuartLittlefair/astropy,astropy/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,pllim/astropy,pllim/astropy,lpsinger/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,dhomeier/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,astropy/astropy,lpsinger/astropy,pllim/astropy,larrybradley/astropy,MSeifert04/astropy,mhvk/astropy,pllim/astropy,saimn/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,stargaser/astropy,stargaser/astropy,mhvk/astropy,astropy/astropy,dhomeier/astropy,saimn/astropy,dhomeier/astropy,StuartLittlefair/astropy,bsipocz/astropy,saimn/astropy,stargaser/astropy,bsipocz/astropy,saimn/astropy,larrybradley/astropy,lpsinger/astropy,saimn/astropy,dhomeier/astropy,MSeifert04/astropy,mhvk/astropy,stargaser/astropy,lpsinger/astropy,MSeifert04/astropy,astropy/astropy,larrybradley/astropy,pllim/astropy,mhvk/astropy,mhvk/astropy,astropy/astropy,bsipocz/astropy