pass BUILD_BFLOAT16 to the compiler

cmake/system.cmake

@@ -258,13 +258,6 @@ if (NEED_PIC)
   endif()
 endif ()
 
-if (X86_64)
-  set(SMALL_MATRIX_OPT TRUE)
-endif ()
-if (SMALL_MATRIX_OPT)
-  set(CCOMMON_OPT "${CCOMMON_OPT} -DSMALL_MATRIX_OPT")
-endif ()
-
 if (DYNAMIC_ARCH)
   if (X86 OR X86_64 OR ARM64 OR PPC)
     set(CCOMMON_OPT "${CCOMMON_OPT} -DDYNAMIC_ARCH")
@@ -469,6 +462,9 @@ endif()
 if (BUILD_COMPLEX16)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_COMPLEX16")
 endif()
+if (BUILD_BFLOAT16)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_BFLOAT16")
+endif()
 if(NOT MSVC)
 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CCOMMON_OPT}")
 endif()