MNT: Re-ignore projections.c
MNT: Re-ignore projections.c

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