PyPlot works but calling matplotlib directly from PyCall aborts

```julia

julia> using PyCall

julia> plt = pyimport("matplotlib.pyplot")
PyObject

julia> x = range(0; stop=2*pi, length=1000); y = sin.(3 * x + 4 * cos.(2 * x));

julia> plt.plot(x, y)
This application failed to start because it could not find or load the Qt platform plugin "windows"
in "".

Reinstalling the application may fix this problem.

```
This causes Julia to terminate abruptly.

Yet using PyPlot works ?