`-nostartfiles` does not exist anymore:

tools info:
```
$ xtensa-esp32-elf-ld --version
GNU ld (crosstool-NG esp-14.2.0_20241119) 2.43.1
Copyright (C) 2024 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
```

`-nostartfiles` does not exist anymore:
```
$ xtensa-esp32-elf-ld -nostartfiles
/home/greenowl/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/xtensa-esp-elf-ld: Error: unable to disambiguate: -nostartfiles (did you mean --nostartfiles ?)
$ xtensa-esp32-elf-ld --nostartfiles
/home/greenowl/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/xtensa-esp-elf-ld: unrecognized option '--nostartfiles'
/home/greenowl/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/xtensa-esp-elf-ld: use the --help option for usage information
```

so `build.sh` does not work.