Extract common dependencies into one declaration

The four BSA agents seem to (inherently, as opposed to incidentally)
share the same dependencies. If that's true, we might as well declare
them together in one place.

src/bin/pg_dump/cdb/Makefile

@@ -84,16 +84,18 @@ libgpbsa71.so: cdb_bsa_util.o $(libpq_builddir)/libpq.a
 libgpbsa.so: libgpbsa76.so
 	cp libgpbsa76.so libgpbsa.so
 
-cdb_bsa_dump_agent: cdb_bsa_dump_agent.o cdb_dump_util.o cdb_lockbox.o $(libpq_builddir)/libpq.a
+cdb_bsa_dump_agent cdb_bsa_restore_agent cdb_bsa_query_agent cdb_bsa_delete_agent: cdb_dump_util.o cdb_lockbox.o $(libpq_builddir)/libpq.a
+
+cdb_bsa_dump_agent: cdb_bsa_dump_agent.o
 	$(CC) $(CFLAGS) cdb_bsa_dump_agent.o cdb_dump_util.o cdb_lockbox.o $(PGDUMP_DIR)/dumputils.o $(KEYWRDOBJS) $(libpq) $(LDFLAGS) $(DDBOOSTLIB) $(GPBSALIB) $(LIBS) -o $@
 
-cdb_bsa_restore_agent: cdb_bsa_restore_agent.o cdb_dump_util.o cdb_lockbox.o $(libpq_builddir)/libpq.a
+cdb_bsa_restore_agent: cdb_bsa_restore_agent.o
 	$(CC) $(CFLAGS) cdb_bsa_restore_agent.o cdb_dump_util.o cdb_lockbox.o $(PGDUMP_DIR)/dumputils.o $(KEYWRDOBJS) $(libpq) $(LDFLAGS) $(DDBOOSTLIB) $(GPBSALIB) $(LIBS) -o $@
 
-cdb_bsa_query_agent: cdb_bsa_query_agent.o cdb_dump_util.o cdb_lockbox.o $(libpq_builddir)/libpq.a
+cdb_bsa_query_agent: cdb_bsa_query_agent.o
 	$(CC) $(CFLAGS) cdb_bsa_query_agent.o cdb_dump_util.o cdb_lockbox.o $(PGDUMP_DIR)/dumputils.o $(KEYWRDOBJS) $(libpq) $(LDFLAGS) $(DDBOOSTLIB) $(GPBSALIB) $(LIBS) -o $@
 
-cdb_bsa_delete_agent: cdb_bsa_delete_agent.o cdb_dump_util.o cdb_lockbox.o $(libpq_builddir)/libpq.a
+cdb_bsa_delete_agent: cdb_bsa_delete_agent.o
 	$(CC) $(CFLAGS) cdb_bsa_delete_agent.o cdb_dump_util.o cdb_lockbox.o $(PGDUMP_DIR)/dumputils.o $(KEYWRDOBJS) $(libpq) $(LDFLAGS) $(DDBOOSTLIB) $(GPBSALIB) $(LIBS) -o $@
 
 .PHONY: submake-backend