Revert compat attempts

Author: BioTurboNick

src/gamma_inc.jl

@@ -485,9 +485,6 @@ function gamma_inc_asym(a::Float64, x::Float64, ind::Integer)
     q = (rgammax(a, x) / x) * (1.0 + sm)
     return (1.0 - q, q)
 end
-if VERSION < v"1.5.0"
-     Base.cumprod(itr) = accumulate(Base.mul_prod, itr)
-end
 """
     gamma_inc_taylor_x(a,x,ind)