Remove uses of AssertVariableIsOfType() obsoleted by f2b73c8

Author: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/20230208172705.GA451849@nathanxps13

contrib/basic_archive/basic_archive.c

@@ -81,8 +81,6 @@ _PG_init(void)
 void
 _PG_archive_module_init(ArchiveModuleCallbacks *cb)
 {
-	AssertVariableIsOfType(&_PG_archive_module_init, ArchiveModuleInit);
-
 	cb->check_configured_cb = basic_archive_configured;
 	cb->archive_file_cb = basic_archive_file;
 }

contrib/test_decoding/test_decoding.c

@@ -127,8 +127,6 @@ _PG_init(void)
 void
 _PG_output_plugin_init(OutputPluginCallbacks *cb)
 {
-	AssertVariableIsOfType(&_PG_output_plugin_init, LogicalOutputPluginInit);
-
 	cb->startup_cb = pg_decode_startup;
 	cb->begin_cb = pg_decode_begin_txn;
 	cb->change_cb = pg_decode_change;

src/backend/postmaster/shell_archive.c

@@ -29,8 +29,6 @@ static void shell_archive_shutdown(void);
 void
 shell_archive_init(ArchiveModuleCallbacks *cb)
 {
-	AssertVariableIsOfType(&shell_archive_init, ArchiveModuleInit);
-
 	cb->check_configured_cb = shell_archive_configured;
 	cb->archive_file_cb = shell_archive_file;
 	cb->shutdown_cb = shell_archive_shutdown;

src/backend/replication/pgoutput/pgoutput.c

@@ -248,8 +248,6 @@ static void pgoutput_column_list_init(PGOutputData *data,
 void
 _PG_output_plugin_init(OutputPluginCallbacks *cb)
 {
-	AssertVariableIsOfType(&_PG_output_plugin_init, LogicalOutputPluginInit);
-
 	cb->startup_cb = pgoutput_startup;
 	cb->begin_cb = pgoutput_begin_txn;
 	cb->change_cb = pgoutput_change;