Remove some ancient and unmaintained encoding-conversion test cruft.

In commit 9211919 I claimed that we weren't testing encoding conversion functions, but further poking around reveals that we did have an equivalent though hard-wired set of tests in conversion.sql. AFAICS there is no advantage to doing it like that as compared to letting the catalog contents drive the test, so let the opr_sanity addition stand and remove the now-redundant tests in conversion.sql. Also, remove some infrastructure in src/backend/utils/mb/conversion_procs for building conversion.sql's list of tests. That was unmaintained, and had not corresponded to the actual contents of conversion.sql since 2007 or perhaps even further back.

Author: tglsfdc

src/backend/utils/mb/conversion_procs/Makefile

@@ -14,9 +14,6 @@ include $(top_builddir)/src/Makefile.global
 
 SQLSCRIPT = conversion_create.sql
 
-# This file can be placed as src/test/regress/sql/conversion.sql
-REGRESSION_SCRIPT = conversion.sql
-
 SUBDIRS = \
 ascii_and_mic cyrillic_and_mic euc_cn_and_mic euc_jp_and_sjis \
 euc_kr_and_mic euc_tw_and_big5 latin2_and_win1250 latin_and_mic \
@@ -184,23 +181,6 @@ $(SQLSCRIPT): Makefile
 echo; \
 done > $@
 
-$(REGRESSION_SCRIPT): Makefile
-@set -e; \
-cp regress_prolog $@; \
-set $(CONVERSIONS) ; \
-while [ "$$#" -gt 0 ] ; \
-do \
-name=$$1;shift; \
-se=$$1;shift; \
-de=$$1; shift; \
-func=$$1; shift; \
-obj=$$1; shift; \
-echo "-- $$se --> $$de"; \
-echo "SELECT CONVERT('foo' USING $$name);"; \
-echo "SELECT CONVERT('foo', '$$se', '$$de');"; \
-done >> $@; \
-cat regress_epilogue >> $@;
-
 install: $(SQLSCRIPT) installdirs
 $(INSTALL_DATA) $(SQLSCRIPT) '$(DESTDIR)$(datadir)'