scripts : use official split.py for cpp-httplib (#19588)

scripts : use official split.py for cpp-httplib (#19588)

* scripts : use official split.py for cpp-httplib

Using the official script is safer and ensures the generated code aligns
with the library's standards.

Signed-off-by: Adrien Gallouët <redacted>
* Catch generic errors

Signed-off-by: Adrien Gallouët <redacted>
* Allow print()

Signed-off-by: Adrien Gallouët <redacted>
* Ensure robust cleanup

Signed-off-by: Adrien Gallouët <redacted>
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Signed-off-by: Adrien Gallouët <redacted>