tools/Unix.mk: fix Untracked files defconfig.tmp-e on macOS

[simbit18]

Summary

fix

===============================================================================```
=====
Configuration/Tool: stm32f4discovery/nsh,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2026-04-14 09:32:23
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
chip/stm32_gpio.c:44:11: note: '#pragma message: CONFIG_STM32_USE_LEGACY_PINMAP will be deprecated migrate board.h see tools/stm32_pinmap_tool.py'
   44 | #  pragma message "CONFIG_STM32_USE_LEGACY_PINMAP will be deprecated migrate board.h see tools/stm32_pinmap_tool.py"
      |           ^~~~~~~
  [1/1] Normalize stm32f4discovery/nsh
On branch fix_sim_mac
Your branch is up to date with 'origin/fix_sim_mac'.

Untracked files:
	defconfig.tmp-e

nothing added to commit but untracked files present
===============================================================================
```=====

Impact

Impact on user: NO

Impact on build: Fix Untracked files on macOS

Impact on hardware: NO

Impact on documentation: NO

Impact on security: NO

Impact on compatibility: NO

Testing

GitHub
Linux,MSYS2 and macOS jobs

====================================================================================
Configuration/Tool: stm32f4discovery/nsh,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2026-04-14 12:21:09
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
chip/stm32_gpio.c:44:11: note: '#pragma message: CONFIG_STM32_USE_LEGACY_PINMAP will be deprecated migrate board.h see tools/stm32_pinmap_tool.py'
   44 | #  pragma message "CONFIG_STM32_USE_LEGACY_PINMAP will be deprecated migrate board.h see tools/stm32_pinmap_tool.py"
      |           ^~~~~~~
  [1/1] Normalize stm32f4discovery/nsh
====================================================================================

https://github.com/simbit18/manual-nuttx-ci/actions/runs/24398267437/job/71261706391

[simbit18]

Hi @lupyuen, this PR fixes

On branch master
Your branch is up to date with 'origin/master'.

Untracked files:
   defconfig.tmp-e

nothing added to commit but untracked files present
Removing defconfig.tmp-e

present on all macOS jobs of our NuttX Mirror.

Now all jobs are broken. !

https://github.com/NuttX/nuttx/actions/runs/24427294476