fix: resolve the compilation failure without zfh instruction

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

Related to issue#5279

Author: Srangrang

Makefile.rule

@@ -309,7 +309,7 @@ COMMON_PROF = -pg
 # BUILD_BFLOAT16 = 1
 
 # If you want to enable the experimental HFLOAT16 support
-BUILD_HFLOAT16 = 1
+# BUILD_HFLOAT16 = 1
 
 # Set the thread number threshold beyond which the job array for the threaded level3 BLAS
 # will be allocated on the heap rather than the stack. (This array alone requires 

Makefile.system

@@ -280,7 +280,6 @@ GEMM_GEMV_FORWARD_BF16 = 1
 endif
 ifeq ($(ARCH), riscv)
 GEMM_GEMV_FORWARD = 1
-BUILD_HFLOAT16 = 1
 endif
 ifeq ($(ARCH), power)
 GEMM_GEMV_FORWARD = 1