Remove S2N patching from makefile.
Remove S2N patching from makefile.

I updated the LLVM files (`hmac.ll` and `hmac.bc`) earlier, so they
don't change as a result of this.

bpdavidson/s2n,alexeblee/s2n,PKRoma/s2n,wcs1only/s2n,colmmacc/s2n,bpdavidson/s2n,gibson-compsci/s2n,awslabs/s2n,wcs1only/s2n,jldodds/s2n,bpdavidson/s2n,PKRoma/s2n,gibson-compsci/s2n,jldodds/s2n,alexeblee/s2n,bpdavidson/s2n,gibson-compsci/s2n,raycoll/s2n,colmmacc/s2n,wcs1only/s2n,awslabs/s2n,wcs1only/s2n,wcs1only/s2n,PKRoma/s2n,bpdavidson/s2n,wcs1only/s2n,colmmacc/s2n,PKRoma/s2n,raycoll/s2n,colmmacc/s2n,gibson-compsci/s2n,raycoll/s2n,awslabs/s2n,wcs1only/s2n,colmmacc/s2n,PKRoma/s2n,PKRoma/s2n,alexeblee/s2n,raycoll/s2n,alexeblee/s2n,awslabs/s2n,awslabs/s2n,colmmacc/s2n,raycoll/s2n,alexeblee/s2n,PKRoma/s2n,gibson-compsci/s2n,jldodds/s2n,bpdavidson/s2n,jldodds/s2n,gibson-compsci/s2n,wcs1only/s2n,raycoll/s2n,PKRoma/s2n,jldodds/s2n,awslabs/s2n,alexeblee/s2n