make lapack-test does not return error on failed tests

[h-vetinari]

I returned to conda-forge/openblas-feedstock#122 after a while, and looking at the CI results, there are still errors in the test suite for make lapack-test that do however not propagate the failure.

IOW, results like

			-->   LAPACK TESTING SUMMARY  <--
SUMMARY             	nb test run 	numerical error   	other error  
================   	===========	=================	================  
REAL             	1174263		2	(0.000%)	0	(0.000%)	
DOUBLE PRECISION	1227437		0	(0.000%)	0	(0.000%)	
COMPLEX          	694951		1	(0.000%)	0	(0.000%)	
COMPLEX16         	696320		2	(0.000%)	0	(0.000%)	

--> ALL PRECISIONS	3792971		5	(0.000%)	0	(0.000%)	

still result in a green CI, which is not intentional.

[martin-frbg]

This is actually intentional, as LAPACK testsuite errors (in contrast to BLAS test failures) do not necessarily mean that the build is unsuitable. Please see
http://www.netlib.org/lapack/faq.html#_how_do_i_interpret_lapack_testing_failures