feat[finsh]: Add cmd.c to the source file list of the finsh module

- Fix the issue where the list_thread function cannot be found when MSH_USING_BUILT_IN_COMMANDS is not enabled

Author: wdfk-prog

components/finsh/SConscript

@@ -6,6 +6,7 @@ src     = Split('''
 shell.c
 msh.c
 msh_parse.c
+cmd.c
 ''')
 
 CPPPATH = [cwd]
@@ -14,9 +15,6 @@ LOCAL_CFLAGS = ''
 if rtconfig.PLATFORM in ['gcc']: # only for GCC
     LOCAL_CFLAGS += ' -Wstack-usage=' + str(GetConfigValue('FINSH_THREAD_STACK_SIZE')) # check finsh thread stack size
 
-if GetDepend('MSH_USING_BUILT_IN_COMMANDS'):
-    src += ['cmd.c']
-
 if GetDepend('DFS_USING_POSIX'):
     src += ['msh_file.c']