Add support for FP16 to openBLAS and shgemm on RISCV

Fix INTERFACE64 builds on Loongarch64 with LLVM

fix https://github.com/OpenMathLib/OpenBLAS/issues/5331

- adjust interface to disable "small matrix" pathway
- separate HFLOAT16 from BFLOAT16
- remove SHGEMM_UNROLL_M and SHGEMM_UNROLL_N equal conditions

Related to PR#5290
Co-authored-by Martin

- modify the macro conditions in Makefile.system
- Delete development test code

Related to issue#5279

Added HFLOAT16 support for RISCV64
Added shgemm_kernel_8x8 for RISCV64_ZVL128B and shgemm_kernel_16x8 for RISCV64_ZVL256B based on HFLOAT16
The instruction sets used are ZVFH and ZFH, which need to be supported by RVV1.0

Related to issue #5279
Co-authored-by Linjin Li <linjin_li@163.com>

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.

* Added ARMV9SME target
* Added SGEMM_DIRECT kernel based on SME1

LoongArch64: Rename core

Use microarchitecture name instead of meaningless strings to name the core,
the legacy core is still retained.
1. Rename LOONGSONGENERIC to LA64_GENERIC
2. Rename LOONGSON3R5 to LA464
3. Rename LOONGSON2K1000 to LA264

Small GEMM for AArch64 with SVE

Implement DYNAMIC_ARCH support for riscv64.  Three cpu types are
supported, riscv64_generic, riscv64_zvl256b, riscv64_zvl128b.
The two non-generic kernels require CPU support for RVV 1.0 to
function correctly.  Detecting that a riscv64 device supports
RVV 1.0 is a little complicated as there are some boards on the
market that advertise support for V via hwcap but only support
RVV 0.7.1, which is not binary compatible with RVV 1.0.  The
approach taken is to first try hwprobe.  If hwprobe is not
available, we fall back to hwcap + an additional check to distinguish
between RVV 1.0 and RVV 0.7.1.

Tested on a VM with VLEN=256, a CanMV K230 with VLEN=128 (with only
the big core enabled), a Lichee Pi with RVV 0.7.1 and a VF2 with no
vector.

A compiler with RVV 1.0 support must be used to build OpenBLAS for
riscv64 when DYNAMIC_ARCH=1.

Signed-off-by: Mark Ryan <markdryan@rivosinc.com>

CI: Add clang test for loongarch64

* Filter out FFLAGS that flang-new from LLVM18 no longer supports

Fix LAPACK unit testing build issues.

This is a fairly conservative addition of small matrix kernels using
SVE.