Added dummy encoding and pqexpbuffer files

src/bin/pg_dump/Makefile

src/bin/pg_dump/encoding.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_rewind/parsexlog.c

src/bin/pg_upgrade/Makefile

src/bin/pg_upgrade/encoding.c

src/bin/pgbench/exprparse.y

src/bin/pgbench/pgbench.c

src/bin/pgbench/pgbench.h

src/bin/psql/Makefile

src/bin/psql/encoding.c

src/bin/psql/tab-complete.c

src/bin/scripts/Makefile

src/bin/scripts/createdb.c

src/bin/scripts/encoding.c

src/bin/scripts/pqexpbuffer.c