Simplify mpl-data inclusion in sdists.

With matplotlib#19383, there's no need to list each `mpl-data` subdirectory
individually.

Author: QuLogic

MANIFEST.in

@@ -3,19 +3,12 @@ include pytest.ini
 include MANIFEST.in
 include matplotlibrc.template setup.cfg.template
 include setupext.py setup.py
-include lib/matplotlib/mpl-data/matplotlibrc
-include lib/matplotlib/mpl-data/images/*
-include lib/matplotlib/mpl-data/fonts/ttf/*
-include lib/matplotlib/mpl-data/fonts/pdfcorefonts/*
-include lib/matplotlib/mpl-data/fonts/afm/*
-include lib/matplotlib/mpl-data/plot_directive/*
-include lib/matplotlib/mpl-data/stylelib/*
 recursive-include LICENSE *
 recursive-include doc *
 recursive-include examples *
 recursive-include extern *
 recursive-include lib *
-recursive-include lib/matplotlib/mpl-data/sample_data *
+recursive-include lib/matplotlib/mpl-data *
 recursive-include src  *.cpp *.c *.h *.m
 recursive-include tools *
 recursive-include tutorials *