MAPL Tests are failing with Release builds

[mathomp4]

As found by @tclune, our Release builds of GEOS/MAPL are failing the unit tests. To wit, with ifort:

 Start: <Test_UDsystem_suite.test_convert_floats>
.   end: <Test_UDsystem_suite.test_convert_floats>
forrtl: severe (408): fort: (7): Attempt to use pointer T when it is not associated with a target

Image              PC                Routine            Line        Source
udunits2f.tests    000000000072A89F  Unknown               Unknown  Unknown
udunits2f.tests    000000000047DE25  pf_testsuite_mp_r         108  TestSuite.F90
udunits2f.tests    000000000047DF9D  pf_testsuite_mp_r         108  TestSuite.F90
udunits2f.tests    00000000006428C7  pf_testrunner_mp_         139  TestRunner.F90
udunits2f.tests    000000000064191F  pf_testrunner_mp_         117  TestRunner.F90
udunits2f.tests    00000000005CAB44  funit_mp_generic_         118  FUnit.F90
udunits2f.tests    00000000005C5403  funit_mp_run_              33  FUnit.F90
udunits2f.tests    00000000005CD9C4  funit_main_                16  funit_main.F90
udunits2f.tests    000000000042722C  MAIN__                     82  udunits2f.tests_driver.F90
udunits2f.tests    000000000041FFE2  Unknown               Unknown  Unknown
libc-2.31.so       000014A2E2C3E24D  __libc_start_main     Unknown  Unknown
udunits2f.tests    000000000041FEFA  Unknown               Unknown  Unknown

This is only one of many failures. Indeed, it is really not happy.

[mathomp4]

Weird update. #3337 shows all the tests passed!

Meanwhile, @tclune said NAG failed for him and Intel failed for me.