Modify the Regression Test Suite Makefile to dynamically install the pltsql extension before running the tests.
Modify the Regression Test Suite Makefile to dynamically install the
pltsql extension before running the tests.

tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres