Allow the disable of just the LAPACK test for STEQR() (trilinos#2410)

This is the only function that continues to segfault on Power8 and Power9
builds using NETLIB LAPACK in debug builds.  All of the Trilinos code
downstream has removed a dependence on this LAPACK function. This will allow
the rest of the LAPACK tests to be run in Power8 and Power9 'debug' builds.

packages/teuchos/numerics/test/LAPACK/CMakeLists.txt

@@ -1,8 +1,13 @@
-
+IF (${PACKAGE_NAME}_DISABLE_STEQR_TEST)
+  SET(${PACKAGE_NAME}_LAPACK_test_DEFINES -DTEUCHOSNUMERICS_DISABLE_STEQR_TEST)
+ELSE()
+  SET(${PACKAGE_NAME}_LAPACK_test_DEFINES)
+ENDIF()
 
 TRIBITS_ADD_EXECUTABLE_AND_TEST(
   LAPACK_test  
   SOURCES cxx_main.cpp
+  TARGET_DEFINES ${${PACKAGE_NAME}_LAPACK_test_DEFINES}
   ARGS -v
   COMM serial mpi
   NUM_MPI_PROCS 1

packages/teuchos/numerics/test/LAPACK/cxx_main.cpp

@@ -214,6 +214,8 @@ int main(int argc, char* argv[])
 
   if (verbose) std::cout << "STEQR test ... ";
 
+#ifndef TEUCHOSNUMERICS_DISABLE_STEQR_TEST
+
   const int n_steqr = 10;
   std::vector<MagnitudeType> diagonal(n_steqr);
   std::vector<MagnitudeType> subdiagonal(n_steqr-1);
@@ -254,6 +256,12 @@ int main(int argc, char* argv[])
     numberFailedTests++;
   }
 
+#else // TEUCHOSNUMERICS_DISABLE_STEQR_TEST
+
+  if (verbose) std::cout << "SKIPPED!\n";
+
+#endif // TEUCHOSNUMERICS_DISABLE_STEQR_TEST
+
   if(numberFailedTests > 0)
     {
       if (verbose) {