[armlibc] 修复AC6更新至6.19后_sys_tmpnam()函数编译报错 (#6647)

* [armlibc] 修复AC6更新至6.19后_sys_tmpnam()函数编译报错
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

components/libc/compilers/armlibc/syscalls.c

@@ -282,11 +282,18 @@ int _sys_seek(FILEHANDLE fh, long pos)
 /**
  * used by tmpnam() or tmpfile()
  */
+#if __ARMCC_VERSION >= 6190000
+void _sys_tmpnam(char *name, int fileno, unsigned maxlength)
+{
+    rt_snprintf(name, maxlength, "tem%03d", fileno);
+}
+#else
 int _sys_tmpnam(char *name, int fileno, unsigned maxlength)
 {
     rt_snprintf(name, maxlength, "tem%03d", fileno);
     return 1;
 }
+#endif /* __ARMCC_VERSION >= 6190000 */
 
 char *_sys_command_string(char *cmd, int len)
 {