Already removed from RPM template in:
15e5419a74 ("Initial RPM sources update for QGIS3", 2017-10-01)
Python ext-libs removed in:
f10e9eee7d ("remove python ext-libs that should meanwhile available
everywhere", 2017-03-09)
Last use removed from scripts/process_function_template.py in:
d37a79943f ("handle utf-8 in function help", 2018-09-17)
b15f6facd7