note on normal distribution inv_cdf_quadrature_like X_OUT

[hkershaw-brown]

note since we've had people hit this while debugging other problems:

inv_cdf_quadrature_like dummy argument with an explicit INTENT(OUT) declaration is not given an explicit value. [X_OUT]

ifort (IFORT) 2021.10.0 20230609 mpif90 -O -assume buffered_io'

cd models/lorenz_96/work/
./quickbuild.sh filter
/glade/derecho/scratch/hkershaw/DART/Bugs/intent_out/assimilation_code/modules/assimilation/normal_distribution_mod.f90(497): warning #6843: A dummy argument with an explicit INTENT(OUT) declaration is not given an explicit value.   [X_OUT]
subroutine inv_cdf_quadrature_like(quantiles, ens, likelihood, ens_size, cdf, p, x_out) 

Note previously from qceff review #458 https://github.com/NCAR/DART/issues/458#issuecomment-1607915383, unresolved.

inv_cdf_quadrature_like routine unused.