Make the locale location relocatable.

src/backend/main/main.c

src/bin/initdb/initdb.c

src/bin/pg_controldata/Makefile

src/bin/pg_controldata/pg_controldata.c

src/bin/pg_dump/Makefile

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dumpall.c

src/bin/pg_dump/pg_restore.c

src/bin/pg_resetxlog/Makefile

src/bin/pg_resetxlog/pg_resetxlog.c

src/bin/psql/startup.c

src/bin/scripts/Makefile

src/bin/scripts/clusterdb.c

src/bin/scripts/common.c

src/bin/scripts/common.h

src/bin/scripts/createdb.c

src/bin/scripts/createlang.c

src/bin/scripts/createuser.c

src/bin/scripts/dropdb.c

src/bin/scripts/droplang.c