plpython: Remove plpythonu, plpython2u and associated transform extensions.

Since 19252e8 we reject Python 2 during build configuration. Now that the
dust on the buildfarm has settled, remove extension variants specific to
Python 2.

Reviewed-By: Peter Eisentraut <peter@eisentraut.org>
Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20211031184548.g4sxfe47n2kyi55r@alap3.anarazel.de

Author: anarazel

contrib/hstore_plpython/Makefile

@@ -6,8 +6,8 @@ OBJS = \
 	hstore_plpython.o
 PGFILEDESC = "hstore_plpython - hstore transform for plpython"
 
-EXTENSION = hstore_plpythonu hstore_plpython2u hstore_plpython3u
-DATA = hstore_plpythonu--1.0.sql hstore_plpython2u--1.0.sql hstore_plpython3u--1.0.sql
+EXTENSION = hstore_plpython3u
+DATA = hstore_plpython3u--1.0.sql
 
 REGRESS = hstore_plpython
 REGRESS_PLPYTHON3_MANGLE := $(REGRESS)

contrib/hstore_plpython/hstore_plpython2u--1.0.sql

@@ -4,12 +4,12 @@ MODULE_big = jsonb_plpython$(python_majorversion)
 OBJS = \
 	$(WIN32RES) \
 	jsonb_plpython.o
-PGFILEDESC = "jsonb_plpython - transform between jsonb and plpythonu"
+PGFILEDESC = "jsonb_plpython - jsonb transform for plpython"
 
 PG_CPPFLAGS = -I$(top_srcdir)/src/pl/plpython $(python_includespec) -DPLPYTHON_LIBNAME='"plpython$(python_majorversion)"'
 
-EXTENSION = jsonb_plpythonu jsonb_plpython2u jsonb_plpython3u
-DATA = jsonb_plpythonu--1.0.sql jsonb_plpython2u--1.0.sql jsonb_plpython3u--1.0.sql
+EXTENSION = jsonb_plpython3u
+DATA = jsonb_plpython3u--1.0.sql
 
 REGRESS = jsonb_plpython
 REGRESS_PLPYTHON3_MANGLE := $(REGRESS)