For SMALL_MATRIX_OPT and MAX_STACK_ALLOC

Use:

nm -gC bbdir/libopenblas.a | grep drot
❯ gcc trial.c -o trail -I$(pwd)/tmpmake/include -L$(pwd)/bbdir -lopenblas -Wl,--verbose | grep openblas
❯ ./trail
Resulting vectors:
x: 3.000000 4.000000 5.000000 6.000000
y: 2.000000 2.000000 2.000000 2.000000

Fix NAN handling in ARM/generic SCAL; have AzureCI Windows show errors on failure

Correctly detect ARM Neoverse V2 CPUs.

* avoid setting nthreads higher than available

Disable GEMM3M for generic targets (not implemented)

POWER: Fix issues in zscal to address lapack failures

Commit def4996 fixed issues with inf and nan values in zscal,
but used FLT_MAX, where DBL_MAX or isinf() is more appropriate,
as FLT_MAX is for single precision only.
Using FLT_MAX caused test case failures in the LAPACK tests.

isinf() is consistent with the later fix 969601a1

This patch fixes following lapack failures with clang compiler on POWER.
zed.out: ZVX:   18 out of  5190 tests failed to pass the threshold
zgd.out: ZGV drivers:     25 out of   1092 tests failed to pass the threshold
zgd.out: ZGV drivers:      6 out of   1092 tests failed to pass the threshold