test_potrs.c: remove pragma darwin-aarch64 support

Using GCC 14.2.0 on Darwin, the pragma ultimately causes a linker error
"ld: invalid r_symbolnum=". The current workaround is to use the old
linker, but (a) it's deprecated and (b) it can produce libraries that
are subsequently not linkable with the newer linker in dependents: the
new ld64 does not link to libraries with duplicate rpaths created by the
classic linker.

Makefile.system

@@ -436,10 +436,6 @@ CCOMMON_OPT += -Wl,-ld_classic
 FCOMMON_OPT += -Wl,-ld_classic
 endif
 ifeq (x$(XCVER), x 16)
-ifeq ($(C_COMPILER), GCC)
-CCOMMON_OPT += -Wl,-ld_classic
-FCOMMON_OPT += -Wl,-ld_classic
-endif
 ifeq ($(F_COMPILER), GFORTRAN)
 override CEXTRALIB := $(filter-out(-lto_library, $(CEXTRALIB))) 
 endif

utest/test_potrs.c

@@ -32,7 +32,6 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **********************************************************************************/
 
 #include "openblas_utest.h"
-#pragma GCC optimize("no-gcse")
 /*
 void BLASFUNC(cpotrf)(char*, BLASINT*, complex float*, BLASINT*, BLASINT*);
 void BLASFUNC(zpotrs_(char*, BLASINT*, BLASINT*, complex double*,