Delete wcsconfig.h if building for system wcslib
Delete wcsconfig.h if building for system wcslib

saimn/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,mhvk/astropy,kelle/astropy,kelle/astropy,astropy/astropy,mhvk/astropy,funbaker/astropy,dhomeier/astropy,dhomeier/astropy,saimn/astropy,funbaker/astropy,tbabej/astropy,saimn/astropy,DougBurke/astropy,kelle/astropy,funbaker/astropy,pllim/astropy,astropy/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,DougBurke/astropy,joergdietrich/astropy,joergdietrich/astropy,saimn/astropy,StuartLittlefair/astropy,bsipocz/astropy,saimn/astropy,dhomeier/astropy,larrybradley/astropy,lpsinger/astropy,joergdietrich/astropy,kelle/astropy,larrybradley/astropy,funbaker/astropy,StuartLittlefair/astropy,DougBurke/astropy,tbabej/astropy,astropy/astropy,bsipocz/astropy,StuartLittlefair/astropy,MSeifert04/astropy,AustereCuriosity/astropy,bsipocz/astropy,tbabej/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,stargaser/astropy,MSeifert04/astropy,stargaser/astropy,astropy/astropy,AustereCuriosity/astropy,MSeifert04/astropy,joergdietrich/astropy,mhvk/astropy,joergdietrich/astropy,stargaser/astropy,stargaser/astropy,DougBurke/astropy,kelle/astropy,pllim/astropy,aleksandr-bakanov/astropy,tbabej/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,larrybradley/astropy,tbabej/astropy,AustereCuriosity/astropy,pllim/astropy,lpsinger/astropy,lpsinger/astropy,dhomeier/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,larrybradley/astropy,MSeifert04/astropy,pllim/astropy,aleksandr-bakanov/astropy,mhvk/astropy,astropy/astropy