RTEMS Source Builder | Download-only mode fails if python headers are not installed (#154)

[Kinsey Moore (@opticron)]

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/154



## Summary
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When using `--source-only-download`, the command will fail and exit prematurely if python3 development headers are not installed. This check should not prevent the download from occurring.

```
error: config error: gdb-common-1.cfg:123: "gdb: python: header file not found: python3.13/Python.h, please install"
```


## Steps to reproduce
Run source only download on a freshly installed system without python development headers.

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/154
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